Hi all-semi experienced hobbyist here. This Bulova auto 23 j was not running at all when I started. Cleaned and oiled it, and when I dropped the balance back in- it started ticking away like a champ. Ran for 2 hours in all positions and I thought I was home free. Then-it stopped and is reluctant to start again. I've had the balance in and out a few times and it is still not running much. The balance pivots look great, the balance jewels are clean/intact. Here are my thoughts of what might be wrong and I wanted your opinion: Theory #1: If I give it a puff of air-balance spins nicely but will stop randomly after a while if I move position. I'm thinking balance wheel is out of true and is rubbing at some point and stopping. Visually-it looks level, I don't have the tools to check it. The clearance to the center wheel seems awful tight and I'm wondering if when turned face up-gravity is dropping the balance down closer to the center wheel causing it to rub and stop. I checked all screw heads and none are high and catching balance. Theory #2: When I opened the balance cap jewel shock absorber assemblies to oil-they were quite tight to re-engage. Although balance drops back in easier than any other watch I've worked on-I'm wondering if the balance pivots are being held too tightly at one of the jewels causing it to stop. I see no jewel cracks. Short of bringing it in to someone to check balance-I'm wondering if there is anything else you might suggest I check? Watch has power-but something is stopping balance....Thanks!