My POD HD 400 automatically activates the "preset" knob which I use as a Reverb knob for my effects. It doesn't only modify the amount of effect by taking it to 99% instead of the 10% I usually have it set up, but it even changes the kind of reverb (I usually use the "room" reverb, but it goes to "plate" on its own). This is the first time it happens. I tried updating the firmware and the flash memory with the Line6 Monkey, but the problem is still there. What else could I do to solve this problem? Have you heard of something similar on other Line 6 products? Thanks in advance for your help on this.