Real-Time Clock is running fast/slow, and may lose time when powered off.
Explanation of Issue
This is an issue with the Real-Time Clock module. Often, the battery that maintains the RTC has failed. Replacing this battery typically restores correct operation.
The RTC battery does not have any affect on show data.
Rarely, the RTC module itself has failed. If this is the case, the RTC chip will need to be replaced