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BBB (rev C) clock drift randomly

We are using BBB (rev C) in our data logger product.

It is running on Linux and Node.js and it communicates with other module via RS232 port all the time.

When the device is booted, BBB gets the correct time, but since our network doesn't connect to NTP server, it will run without it.

Then the system time drifts, randomly

One test drifted 1 min in 4 Hours, another time 1 min in 16 hours, another 4 seconds in 6 hours, and so on

Any suggestion? (maybe there is a way to make BBB to resync to its RTC once a while?)

Thanks for any pointer!