I just noticed the clock on my Yaesu VX-7R is running very fast. I noticed this a few days ago, where it would be days ahead. I would reset the time to the second and then, again, hours or days ahead.
I'm not sure when this started happening, or if it has always been this way. The unit was purchased new a few years ago. I guess I never had the clock on the display at all, but I've recently tweaked the settings to show the clock on the main display at all times.
Finally, today I set it and saw that it was running minutes fast. It would be 2-3 minutes ahead after only one minute of actual wallclock time.
One hint on an old forum suggested doing a Microprocessor Resetting as per the instructions in the manual, but this did not change the behaviour.