I think so, and if I am, that's not a bad success rate I guess. My thinking at this point is that possibly hop matter or something got stuck in the impeller while I was pumping through CFC, with music on and fan running, etc. and these pumps are quiet.
It still seems unlikely though because I recirc'd and had been pumping (getting close to verify pump operation) for 20 minutes at that point, so it's hard to imagine a hard chunk of hop pellet still existed...but at one point it seemed like I couldn't get flow through the pump with gravity, after it stopped, so I back-flushed it, then it would flow (not run, but liquid would flow through it using gravity).
So either it seized on it's own momentarily and burned itself up, or debris clogged the impeller. That's the down-side to low-powered pumps. If you do get something minor in there, it doesn't have the power to bust it up and keep going. These are my thoughts, anyway.