Unfortunately it still happens…
and also sometimes it freezes time in some modules, the main controller still working ok but the clock info freezes on the LCD (this is not fault of the main PIC18F as the other routines and peripheral are working ok).

I am beginning to hate these DS1307 chips …
The strange thing is that this only happen in some units, and I am not able replicate the problem in the lab.

Anyone had problems with time being freeze in the RTC for no reason?!