Generally, if the movement is erratic in chiming, then I suspect some wear on the chime side, and that is exactly where most of the problems with this type of clock begins. And, for your information, if it doesn't chime, it won't strike the hour either, because the chiming must first be completed before it will strike the hour. If at some point it starts chiming again as you have said, then most likely it will be out of sequence with the actual quarters, and should it continue to chime for awhile, it WILL get itself back into sequence, but if there is another failure during this time for it to chime, then it is all out of whack again.My advice, see a reputable repairman in your area. If you want I can find a clock repair company in your area let me know your location and by what major cities and I'll find a few in your area.
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