The RTC on C3 is still using the LSI clock source. This was to avoid triggering the WDT on first boot, but the WDT was updated to allow more grace time at boot. The RTC needs to be set back to using the LSE clock in order to keep time accurately. LSI is really terrible...
The RTC on C3 is still using the LSI clock source. This was to avoid triggering the WDT on first boot, but the WDT was updated to allow more grace time at boot. The RTC needs to be set back to using the LSE clock in order to keep time accurately. LSI is really terrible...