Hi, I have had the same problem with a Logitech Cordless Desktop setup. The mouse and keyboard had been used in an office environment for about two years, then the mouse would double click unexpectedly, would not hold items when trying to drag them and the right click would sometimes fail to work ...then sometimes it would work perfectly. I tried all the other suggested cures such as cleaning out the inside of the mouse, new batteries and reinstalling the driver which did not prove to be effective. A good clean improved things for a couple of days but the symptoms returned. At this point, I dismantled the mouse and resoldered some suspicious looking joints on the circuit board inside, especially those attaching the microswitches for the mouse buttons. Since then, none of the problems have recurred. I presume that repeated pressure on the switches over time had cracked the solder joints which caused the mouse to behave erratically. You could try this, but dont get the joints too hot or you will damage the switches or other sensitive components. Simon.
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Hello, if the mouse is double clicking randomly means the mouse button or button soldering are broken, maybe you might want to try opening it up and resoldering the mouse button, if it doesn't work you can use an old mouse button that fits the space and solder that one in the mouse that's having problems, reassemble and see if it works, the good news is that most of the time it does.
I had the exact same problem with my original Logitech wireless mouse that came with a wireless keyboard. I eventually figured that the button component inside the mouse wasn't making consistent contact causing unintended double clicking or dropping while dragging.
I fixed it by doing some soldering to switch the left mouse button with the right mouse button, since I didn't have to use double clicking or dragging with the right mouse button. It worked pretty well for several months until the switched left button started showing the same problem again.
Now my newer Logitech mouse (it's more expensive Nano wireless mouse) is having the same problem after about 1 year using it. I think there's a serious durability problem with the button component that Logitech is putting on their mice. I may do the same trick again on this mouse, but now I don't consider Logitech as a good mouse manufacturer anymore. They used to make good quality hardwares but I guess they aren't that good anymore with all those cheap Chinese suppliers for their parts. :(
You can probably repair this yourself if you are technically inclined and careful.
There is a tutorial here showing how to disassemble the mouse: http://www.vk2k.com/Logitech-MX1000-Battery/
The microswitches for the buttons can be opened if you are very careful, and then you'll have to clean the contacts. Regular rubbing alcohol should work fine. Be careful not to lose any parts when opening the switch.
If the switch contacts have corroded, you may have to replace the contacts or the entire switch. You may be able to take a similar switch from another mouse (many manufacturers use similar switches). SWometimes there are MX1000 or similar logitech nonfunctioning mice being sold on eBay for parts.