*UPDATE*
I had a friend of mine who works on pedals take a look at the offending Big Muff. Turns out the solder joints were the cause. The switch was also super wobbly from the factory. He fixed that and added some padding to make the unit a bit more sturdy.
Frankly I’m kind of shocked how flimsy these things are after looking inside one. I guess I can’t expect much for $80 these days.
Okay…so my follow up question would be how do I proceed to get the pedal fixed? Do I need to send it somewhere? When I replaced the battery I removed the cover to check for an obviously loose wire but everything looked snug and secure.
Thanks for your prompt response!