My NavSpark, used in an ntp server, had been giving NMEA timestamps roughly within about 200ms off of actual time.
I checked on it today, and noticed the timestamps had fallen behind by over 1 second of actual.
After plugging/replugging, the time is still off by 1 second.
I sent a binary cold start command to it as well (several times), and the time is still off.
Location and altitude are still just as accurate as before.
Any ideas what would cause this jump from actual, and why it persists?