Supertrend log files just stopped one day?

For three years we have been logging a handful of temperatures through a Supertrend “log to file” and have had no issues. It saves a new file every day at 23:59:59.###.
Today, we noticed that the last file save was yesterday at 16:01:26. I cannot figure out why the logging has stopped?
Pac control strategy is still running with no errors, there was no power bump, and our backup historian using OPC / Canary is still populated with data. I cannot reboot the system as of right now.
Has anyone else have this issue in the past? (we are running version R10.3b for display & 10.3c for control)