So this kind of has me worried lately... I can turn my amp on and it doesn't crank out the distortion once in a while. I have to flick the switch to the middle and back down again for it to kick back in. Any ideas what it means?
What switch where? Not enough info.

Pickup switch on the guitar - dirty switch, get some contact cleaner, squirt it, work it back and forth a dozen times, try it out.

Switch on the amp - Not enough info but possibly the same, dirty switch.
Hmmm...I wonder what this button does...