"BAD TRACK" Everything was fine...downloaded some new music yesterday, listened to it...now today the songs I downloaded (and many more) say "BAD TRACK" and the sansa skips to another song...sometimes skipping madly through my playlist, seemingly at random. HELP!

Here is a good post that can help you with downloading music on to Android devices. Basically you will need to download one of these apps and navigate to a website that has free music to download.
Top Free Android Apps to Download Music mp3 downloader GetAndroidstuff

I've had this happen a couple of times in the last 6 months. You can get it to play again by chosing the format option from the settings menu. Of course, then you've lost everything you had loaded on to it. Download your music/audio books again and they will play.

You have songs that may be protected or the wrong format for your device.
delete the bad song and download another copy from a different source and try it.
This is not to uncommon due to different file formats and protection in the song files
When you rip songs from another device often some won't load or play in another device
especially if they are paid for songs.

The database has been corrupted, click HERE for how to properly format and reload firmware if need be...

Renew your music sub and resync

I would try formatting the drive/player. Why can't you delete the bad file?

Hi tooky. Getting a "Bad Track" message on the E250 may be an indication of memory corruption, music file corruption, or outdated subscription/license info. One solution would be to format your player in Windows Media Player (version 10 or 11): 1. Make sure your player is in MTP mode by navigating the menu as follows: Menu > Settings > USB Mode You would get a choice of "MTP" or "MSC". Please select "MTP". If your player is an "E250 Rhapsody series" player, select "Plays for Sure". 2. Plug your player to your PC and run Windows Media Player. Click on the "Sync" tab and make sure the E250 is listed. Look for the "Format" button (it would look like a "pencil" on Windows Media Player 10) and click on it. Follow the on-screen prompt. 3. Re-load your songs by either copying/pasting your songs to the player or by using Windows Media Player's "Synchronization" feature. You could also format the player while in "MSC" or "Rhapsody" mode by browsing the player in Explorer, right-clicking the drive letter corresponding to the player, then select "Format". Follow the on-screen prompts Another solution would be to update the firmware of your player by downloading the Sansa Firmware Updater using this link from the SanDisk website (instructions are found on this site as well): For standard E250 or E250R "Rhapsody Series": http://www.sandisk.com/Retail/Default.aspx?CatID=1376 Make sure your player is set to MSC mode, or "Rhapsody" Mode The type of music file might also be the cause. If your music files are licensed, purchased or acquired via subscription, you may want to contact the provider for more info on how to re-download the music files. I hope this helps. There are other procedures available but these might actually make your player work normally again. Hoping for the best :)

your firmware probably found a glitch in that song. try to delete your firmware or delete the song and download from a difrent database