I kept my Sansa e250 v2 in storage for along time, I think more that 6 months. The battery drained out. I connected the device to the computer, and it started behaving abnormal, kind of restarting itself.
It has software version: 03.01.11E and has never been updated.
Please see this video: http://www.youtube.com/watch?v=gPSDU9yuKJk
Right after the device starts, it says: connected - refresh database - writting - disconnected and repeats these steps forever while device is connected to USB on PC.
I tried to start in the “secret handshake mode” by using the Rec button while on Hold and connecting the USB cable. An MTP device appears in Windows Explorer but it is not accessible because the device restarts very quiqly, or better said, it exits that state very quickly.
I formated the device from it’s menu but this didn’t fixed the problem.
If the device is not connected via USB, it behaves normal, but it is not of much use because I can not upload files on it.