Anyone had this issue? Would love some help troubleshooting. Essentially my tube channel will randomly cut out or drop in volume massively (get a weird thin tinny sound). Switching to the FET channel fixes this problem most of the time. Occasionally the whole thing cuts out and won't work for several minutes, restarting it sometimes helps. signal light is still going most of the time but no sound. Tried plugging the bass into the effects loop and sometimes it works there when it cuts out and other times it doesn't. The master volume is pretty poppy when turned. This all happens several times a practice (like once every 10-15 minutes). Tried a few different wall plugs thinking it might be a voltage thing. Anything else I can test or suggestions?