A little while back there was a similar case where the time resets back every minute. I suspect this is because the RTC has a problem starting its internal oscillator. I need to investigate if this is a chip problem or software (the code was written for DS1307 but the same code should also work for DS3231). Anyways, you can send an email to [email protected]. If you have s hot air gun, we will send you a new DS3231 chip so you can replace it yourself; if not, you can send your kit back to us and we will get it replaced for you. Sorry about the issue.