Disconected well when i first plug my sansa in to the computer it says connected and then about 5 seconds after it says disconnected, but it still charges and stuff, idk whats wrong with it.

Solutions are in order of increasing probability of data loss AND device recovery.
Screen messages are loose approximations

A Soft Reset
1. Hold Power switch up for 5 seconds.
2. Screen displays "Goodbye".
3. Restart

B. Hard Reset
1. Hold Power Switch for 30 seconds
2. Restart

C. Recovery Mode
1. Hold Power Switch for 5 seconds to switch device Off
2. Move switch to Hold
3. Press and hold Home button
4. Connect USB cable to device
5. Screen displays "USB" in small type and "16 MB Format" shows up in My Computer
6. Copy firmware files to "16 MB Format" drive letter
7. Disconnect USB cable
8. Screen displays "Firmware update"
9. Restart device

C. Force Format (This one wipes the data partition. Make sure all needed music/pictures/video exist elsewhere)

1. Hold Power Switch for 5 seconds to switch device Off
2. Move switch to Hold
3. Press and hold top/North/up of Scroll Wheel
4. Connect USB cable to device
5. Screen displays "Format and lose data"
6. Press right/East on Scroll Wheel to confirm
7. Screen displays "Formatting"
8. Restart device

D. Manufacturing Mode (included for completeness only)
1. Hold Power Switch for 5 seconds to switch device Off
2. Move switch to Hold
3. Press and hold centre of Scroll Wheel button
4. Connect USB cable to device
5. Windows detects a new hardware device
6. ???
7. ???
8. ???

Make sure USB mode is MSC....If this doesn't work make sure that you are connected to a 2.0 USB port....I had to install the update on to my labtop and finally it recognized it and updated....
Download Update if you haven't yet(http://mp3support.sandisk.com/sansa/Installer/1082/SansaUpdaterInstall.exe)
Then connect to your computer and see if it works
Hope it does..........Please rate

This is and excerpt from "EphMusicFan" on the Real player forum. Original link is also below.

" The following steps finally fixed everything for me. While it may seem long, it only takes about 15 minutes and should fix everything.

If you run windows XP don't have Windows Media Player 11 installed, download and install it here,
http://www.microsoft.com/windows/windowsmedia/player/download/download.aspx

Run Windows Update, and install all high priority and optional updates related to Windows Media Player or device synchronization.
On XP, the updates include:
Update for Windows Media Format 11 SDK for Windows XP (KB929399)
Security Update for Windows Media Player 11 for Windows XP (KB936782)
Update for Windows Media Player 11 for Windows XP (KB939683)
Security Update for Windows XP with Windows Media Format Runtime 9.5 and 11 (KB941569)

Open Rhapsody
From 'My Account' menu select de-authorize computer
Close Rhapsody

To delete the mcs.rma file:

1. Close RealPlayer/Rhapsody
2. Click the Windows Start button. Then click Run.
3. Type %windir%\system32\ and click OK.
4. Find the mcs.rma file.
5. Right-click mcs.rma and select Delete.
6. Close the window.

To delete the basi3260.dll file:

1. Open the My Computer icon on your desktop.
2. Open the C: drive (usually Local Disk (C:\)).
3. Open the Program Files folder.
4. Open the Common Files folder.
5. Open the Real folder.
6. Open the Plugins folder.
7. Find the basi3260.dll file.
8. Right-click basi3260.dll and select Delete.
9. Close the window.
10. Restart your computer.


on sansa Clip itself, disconnected from computer, go to settings, then choose format

Make sure Rhapsody, Windows Media Player, and all other media programs are closed

download firmware
http://forums.sandisk.com/sansa/board/message?board.id=clip&thread.id=2946 (make sure you get 'Americas' firmware version)
unzip firmware file
connect to computer
drag firmware file onto sansa Clip icon in Windows explorer
wait to finish all copying (Sansa Clip screen will say connected, not writing or reading)

disconect
firmware updates on device, then it shuts off automatically
turn it back on
reformat from device (settings menu, format)
put in msc (under USB mode on settings menu)

reconect
open sansa Clip E:/ in Windows explorer, delete all files (should be 6-8 folders and files in top level directory of Clip)
reformat from windows explorer (right click, format, (FAT file system, NOT FAT32))

disconect
put in mtp (under USB mode on settings menu)

Open Rhapsody
It will run through quick setup again, due to files deleted before.
'Reathorize Computer' (under 'My Account' menu)
"Update Track Licenses' (same menu)

connect to computer
wait for Rhapsody to fully load clip (may take 30 seconds)
reformat from rhapsody (right click on sansa clip icon in rhapsody, select reformat)
hold down control and shift buttons at same time, right click on sansa clip icon in Rhapsody, select 'reset secure clock'
right click on sansa clip icon in rhapsody, select authorize device
wait while sansa clip updates (wait for screen of device to say 'connected' for a while, rather than writing or reading)

disconect

reconnect
wait a while updates finish

disconect
verify acount, and dates on device, under setting menu, account
should say renewed (with today's date) expires a date 30 days later.


download one new track from rhapsody you never have downloaded before

reconect
transfer that one track to clip
wait for all updates to finish

disconect
verify account, dates on device, check that the track plays properly"

Hope that helps.

http://real.lithium.com/real/board/message?board.id=InstallingRhapsody&thread.id=26724

Try going to the actual file the music is in on your computer, then right click Send To sansa 250. If that doesn't work look on the options menu for USB mode and change it, that works on my 280.

These are the most common methods for recovering Sandisk's Sansa Mp3 Players. I have been almost universally successful in recovering Sansa players using one or a combination of these methods. These methods do not work if you are having synchronization or music format issues - they are for recovering a player that will not power up, freezes, flashes, is not recognized by the computer, and a host of other issues.

Reset the Sansa Player first. On most models, restart is done by holding the power button in for 15 seconds or longer. Check your specific manual to be sure. The manuals are available from the Sansa website if they have been misplaced.
Download the Sansa Recovery Tool from the Sansa website.
Format - Erases Everything: Connect your Sansa player to the computer and open Windows Media Player. Click on the Sync tab. Pull down the drop down menu underneath the Sync tab by moving your cursor over the Sync tab and left clicking on the little black arrow underneath the Sync tab. Highlight "Sansa 1GB" (wording may vary slightly), and then select "Format." - this should erase everything.
Firmware Upgrade- Erases Everything: Get the latest firmware upgrade from Sansa - it updates the firmware and erases every song in the player all at once. Note: this method doesn't work if already have the latest firmware. Go to this website and click "Firmware Updater" to find out: http://www.sandisk.com/DriverDownload/driverList.asp
If these fail, then:
Try this: disconnect the player from the computer, turn it off, hold in the volume + button, and reconnect the player to the computer while holding the volume + button in. Keep holding the volume + button for an additional 5-50 seconds. Windows should eventually go into recovery mode and revive the player- it will pop up a window that says Found New Hardware Wizard.
If you get the problem where MTP Device keeps popping up continuously, uninstall the “MTP Device” by going to Start à Control Panel àSystem à Hardware à Device Manager (you computer may vary slightly, depending on Windows Version).
You may have to restart your computer after each of these methods to get them to work properly. Disconnect your Sansa player BEFORE shutting down your computer.
-Tha Mp3 Doctor

what operating sytem are you running? what version of windows?

SanDisk Sansa View - Reset - Use the slide switch on the side and hold it tward the Mic hole for 10 sec. Then try to reload the drivers onto your computer, and use the disconnect button in the software, then re-connect the USB plug.

Try this: disconnect the player from the computer, hold in the volume + button, and reconnect the player to the computer while holding the volume + button in. Keep holding the volume + button for an additional 5-50 seconds. Windows should eventually go into recovery mode and revive the player- it will pop up a window that says Found New Hardware Wizard.
-----
Download the Sansa Recovery Tool from the Sansa website.
Format - Erases Everything: Connect your Sansa player to the computer and open Windows Media Player. Click on the Sync tab. Pull down the drop down menu underneath the Sync tab by moving your cursor over the Sync tab and left clicking on the little black arrow underneath the Sync tab. Highlight "Sansa 1GB" (wording may vary slightly), and then select "Format." - this should erase everything.
Firmware Upgrade- Erases Everything: Get the latest firmware upgrade from Sansa - it updates the firmware and erases every song in the player all at once. Note: this method doesn't work if already have the latest firmware. Go to this website and click "Firmware Updater" to find out: http://www.sandisk.com/Retail/DriverDownloads.aspx
or
http://www.sandisk.com/DriverDownload/driverList.asp
-Tha Mp3 Doctor

try going to recovery mode and upgarade the firmware of the player. Recovery mode = enable hold switch press the record button and press the menu button until it shows welcome to recovery mode on the player.

These are the most common methods for recovering Sandisk's Sansa Mp3 Players. I have been almost universally successful in recovering Sansa players using one or a combination of these methods. These methods do not work if you are having synchronization or music format issues - they are for recovering a player that will not power up, freezes, flashes, is not recognized by the computer, and a host of other issues.

Reset the Sansa Player first. On most models, restart is done by holding the power button in for 15 seconds or longer. Check your specific manual to be sure. The manuals are available from the Sansa website if they have been misplaced.
Download the Sansa Recovery Tool from the Sansa website.
Format - Erases Everything: Connect your Sansa player to the computer and open Windows Media Player. Click on the Sync tab. Pull down the drop down menu underneath the Sync tab by moving your cursor over the Sync tab and left clicking on the little black arrow underneath the Sync tab. Highlight "Sansa 1GB" (wording may vary slightly), and then select "Format." - this should erase everything.
Firmware Upgrade- Erases Everything: Get the latest firmware upgrade from Sansa - it updates the firmware and erases every song in the player all at once. Note: this method doesn't work if already have the latest firmware. Go to this website and click "Firmware Updater" to find out: http://www.sandisk.com/DriverDownload/driverList.asp
If these fail, then:
Try this: disconnect the player from the computer, turn it off, hold in the volume + button, and reconnect the player to the computer while holding the volume + button in. Keep holding the volume + button for an additional 5-50 seconds. Windows should eventually go into recovery mode and revive the player- it will pop up a window that says Found New Hardware Wizard.
If you get the problem where MTP Device keeps popping up continuously, uninstall the “MTP Device” by going to Start à Control Panel àSystem à Hardware à Device Manager (you computer may vary slightly, depending on Windows Version).
You may have to restart your computer after each of these methods to get them to work properly. Disconnect your Sansa player BEFORE shutting down your computer.
-Tha Mp3 Doctor