Starting this afternoon, I have had absolutely NO sound (ringtone, media or otherwise) coming from my phone (and YES, I DID check and make sure the volume/ringer was turned on - multiple times, in fact) when it is supposed to make sounds. I've restarted the phone 2x since I first noticed it and it solves the problem for a little while, but soon returns to silence. Any idea what is going on? This is the second HTC smartphone I've had issues with (I got the original Incredible last year that had to be replaced due to defects), and it is getting quite aggravating, to say the least.
EDIT: I did just update several apps this morning, but I've not installed any new updates for the actual phone recently.