Hello. I have a submariner 116610ln from zzf v3 (apparently, I don't know what mechanism is inside) - today I saw that instead of changing at 00.00 the date changed 00.05, so I started winding the watch to check if it would continue. and as I filmed, the date of the next day started to change at 1.00 am and ended at 6.00 (wtf ??) and so on when trying to wind up. before that there was no problem. does anyone know what might be going on, or how to fix it? can this watch be opened without a key?