Volume control stopped functioning

My clip 1g has been great, has recent FW upgrade. Suddenly the volume control stopped working.  I can turn it down, but not up.  Suggestions?

Return the player for replacement. I’ve seen many Clips with the solder completely missing on one side of the surface mount up volume button. It is most likely a production problem with the reflow soldering process. And also a failure of quality control to catch it.

Try downloading the firmware again, and reinstalling it. If the firmware in the player becomes corrupted, then buttons not working might result. If this doesn’t help, then the problem is probably due to faulty hardware. The firmware in a model of mp3 player not made by Sandisk became corrupted often enough. Reinstalling the firmware solved the problem.