The first time i tried to clean a bearing i accidentally used charcoal starter instead of lighter fluid. After realizing my error, i cleaned it with lighter fluid and played it. The new responsiveness of the yoyo resulted in a nice bruise. Annoyed, i cleaned it again and the same problem occurred before i decided to slap on a different bearing. since then, that bearing has been cleaned several more times and eventually acted exactly as you described it. I cleaned it again and I think that the charcoal starter just made the bearing extremely dirty, so much that the bearing still occasionally stalls. it seems to stall less and less often after multiple cleanings. I guess just try cleaning it several more times, you may have some tough crud on your bearing.