I have a Mesa F30, and I hope someone can help me diagnose a problem I'm having. I took the amp to a tech I use for my amps, and he thought the issue was a bad power tube. That obviously wasn't the issue, as I'm still having the same problem. Every once in a while, I'll play through the amp, and suddenly, the volume will slowly fizzle out, and I'll have nothing coming out of the amp. If I shut the amp off, wait a few minutes and turn it back on, it'll be fine. I don't think it's heat related, as I kept the amp on for hours, trying to recreate the problem, but I couldn't recreate it. It'll just randomly fizzle out. It's not a big deal, as I won't sell the amp, and I won't gig with it, but it's still annoying. I would appreciate your thoughts on what may be causing this. Thanks.