The last week or two my AX8 has started, randomly sounding strange. I will be playing on a patch, and it sounds fine. Then, randomly, it loses bass and get all distorted. Almost like I have a fuzz pedal on. The remedy seems to be, to step on the Scene 2 button, then back to Scene 1. I use Scene 1 as my main rhythm sound on my patches. Has anybody experienced this? How do I solve it? It almost reminds me of a bad pre-amp tube. I run it direct, not in front of a power amp, tube or otherwise.