Yesterday for the first time my sub cut out, and it kept doing it for a few seconds, then it'd come back on for a little bit. The amp was really hot, even though I'd only been running it for about 20 minutes.
I had the gain cranked all the way up at the time, and it's a really old amp. It doesn't seem to do it when the gain's at about 75%, but I haven't really had time to listen to it a lot since yesterday to see if it does.
Any ideas what it could be? My guess is it's just time for a new amp.