I have an Ampeg B2R. Its been a great amp. However, in the last couple weeks, its started crapping out. It plays fine and then....nothing. The cab seems to be fine. The input from my bass seems to be fine. But I get nothing from the amp. (No blue smoke but also no sound.) Then, its starts up again. No reason why. Usually within a couple minutes. I think there is a faint click as it starts up again. I'm afraid its going to act up during a gig. Ideas?