I am having a similar problem with my Flextone III... after 10-20 seconds it drops about half volume. I hit the foot switch channel (same channel) and it brings it back to the volume it was originally set to. It can't be (at least I don't think so) the volume pod because I direct plug the amp out from the stereo outputs in back through the mixer (smokin' tone btw!)... stage volume isn't even on. I did test it using both ways tho, through the amp speakers and direct out and it drops both sources in volume.
I did read on one of the blogs that some one thought it might be a digital problem. is there a way to check that? is there a way to reboot the system and reload it?
Any help would be greatly appreciated, don't want to ditch the amp!
Thanks
Brian