First post... I am currently working with a Line 6 LD 300 Pro. Lately, and I can't tell exactly why, it has been turning on effects by itself, and more often than not, it's the filter envelope; usually it sounds like my amp just ate a thick pillow. The knob positions have no bearing on the changes my amp decides to make (i.e. what exactly it decides to eat). I already had been having problems in which either the channel volume, overall volume, gain, and/or general EQ is inconsistent when switching between channels. I noticed when I finally got the compatible Line 6 shortboard. That was really going to help me use the effects it has available to their full extent; who plays an entire song with super heavy filter envelope or chorus? Anyway, it's hard to tell exactly what is changing because it's inconsistent. But I'll switch from A to B, and B isn't what it's saved as. I'll switch back to A, and A isn't what it's saved at, even though I was just playing it. I have to cycle between channels a couple times before it decides to load the channel properly. This happens using the shortboard and the amp's own buttons. Lastly, it always, ALWAYS, plays show and tell with me when I first turn it on. The audible settings are always in some random, new selection, not corresponding to where the knobs are. It's louder than the tiny Fender Rumble that came with my Squier Affinity P bass, so I'll keep using it. But it's harder to rely on it. I already decided I want/need a new amp, but that's gonna take a bit. What exactly might be wrong? Can I fix it myself? Will I need to replace something? At least it turns on and off when I tell it to.