theElevators,
DeoxIT D5 is my go to for the exact reason you stated. And I use it for those nasty "I'll replace my potentiometers after this weeks last gig" moments.
I have special order cables and two sets on backup,
jpd
dwball,
Have you tested this at your home or practice studio for grins and giggles to check on a known good power circuit? If so, follow rd2rk's suggestion if this keeps up.
I can't remember the component but it will act like a leaking capacitor and give you grief similar to your symptoms. Or it is the power board in the unit (PSU) which does have capacitors. (https://www.digikey.com then put in the part number ECS65US12)
I am sure you've already backed up your setlists and did a factory reset then restored from backup. Last question from me, which is probably a YES from you, are you on the latest firmware and HX Edit?
Anyway, it can be a real head scratcher. Good luck,
jpd