I have no idea how it happened, but my jaw servo on my 3-axis witch just burned up. Literally. It overheated and melted the bottom of the servo case. I took it apart and it looks like a transistor or small chip burned up, and that's where it melted the casing. There was no strain on the motor that I could tell, and the mask hadn't even been attached. I had limits set and everything. It was talking and then all of the sudden the jaw stopped moving.

I swapped out my tilt servo for the jaw servo, so now I have a 2-axis witch instead of a 3-axis witch. But it's very important for my witch to talk! Fortunately, it still looks great without tilt. Will post a video.