Thank’s a ton, Siphonophoid!!
I also just registered here to confirm your solution (and say thanks).
I had the exact same problem with a brand new Big Muff, which developed this issue during playing, kinda out of nowhere. I followed your advice by engaging/disengaging it repeatedly, and voilá Took ~100x for me, but I’m just so glad it’s working again!
Also, it’s even more statisfying, when kicking the shit out of something is the solution to fix it
Cheers!