I've had this problem, too. Toshiba laptop 1 yr old, Windows 8.1. I've determined the following:
- The Sansa Updater doesn't work. Apparently this happens to a lot of people. People have all sorts of fixes for this, but I've not seen where anyone was able to fix it.
- The problem arose with me once I tried to use the Sansa Updater and there was new firmware to "transfer" to the SanDisk Mp3 player.
- I uninstalled the updater (I had several copies by this point), except for one copy of it. I tried just plugging in the Mp3 player just to charge it via laptop. It would work for a 10 or so minutes, then stop charging.
- I got it to work. This is how I did it:
I opened Device Manager
I expanded then looked at the various USB ports
I could see where the one my device was plugged into wasn't working (a yellow exclamation point icon was by it)
I plugged my player into a different USB port, and the same thing happened....another yellow exclamation point icon by the different USB port.
I right-clicked on the USB port and selected the automatic search for newer driver. It found and installed one (took a few seconds)
When that driver updated, it updated ALL USB ports.
I rebooted.
The SanDisk Mp3 clipzip then started charging properly. No exclamation points by the USB ports in Device Manager.
So I think the problem came with either the new firmware that SanDisk tried to transfer to my device and/or the Sansa Updater (which is useless as far as I can tell). The only thing the Sansa Updater has ever done for me is call up the user manaul and want to download it (I already have it).