One thing that might cause this, which is one of my only pet peeves about the phone: I like to leave my phone on vibrate, but sometimes I like to hear the Palm sounds, and sometimes not. So I was thinking of using the side buttons to silence and activate the sounds. However, when you use the side button to re-enable sounds, it automatically changes your ringer from vibrate back to the normal ring. Could this be what happened, dreaderus?

And does anyone know of a shortcut to change only the Palm sounds, but leave the ringer alone, other than going into the Prefs? Thanks!