Hi guys, I'm fairly new to clock repair so I'm a little stumped right now. I picked up an old Gilbert mantle clock that wouldn't run, took it apart, ultra sonic cleaned it, oiled, reassembled, and it's been running fine for a week. Today out of the blue it stopped. Thinking it just needed to be wound, I wound it, but it will only run for several seconds and stop. It's in beat and very even, the hands are not touching, and pendulum is not touching anything, there's no interference that I can see. Where can I begin my troubleshooting?