Tonight I went to band rehearsal with my new Vintera Telecaster (I normally play a Gretsch 6120-55VS). We did about ten songs and then tried the push button on the volume knob to see what it sounded like on one song. Suddenly my amp - Blues Junior (tweed) went silent so we stopped playing. The volume had dropped dramatically. It sounded like I had turned it down to 1. I freaked out and turned it off and waited a few seconds before I turned it on again. Then it sounded just fine and normal again. What could have caused this? I am a bit worried since we have a gig on saturday and I don't want this to happen again.