I am fighting an issue here with a cal. 1220 Omega that gains more than 30s daily. The resonator shows correct frequency on a tester but still the watch gains considerably. It seems to be occasionally "double indexing" just like an Accutron not properly phased. Anyone here who had the same problem before and found a solution other than just changing the entire resonator? Even only an explanation for the cause of this effect would be much appreciated!