1. This is weird. 2. I have no idea what happened? For years, my Audio Muting switch (occasionally engaged for low level listening) has caused an imbalance requiring a turn on the left/right adjustment to center. So, I've likely used this pot more than most. This morning, when brought back to center? It just FROZE. There's no discernible impact on sound -- thankfully it seized centered for normal play -- but this seems quite odd? I'm fighting the urge to really torque and "break it loose" but I'm reasonably certain that's a bad idea and I should just leave it alone?