Jeff Liebermann wrote:

One machine I worked with had a unique problem. When the machine went
into standby, the clock would just stop. When it came out of standby,
it would continue where it left off, losing the time it was in
standby. It was fixed under warranty. I don't recall the vendor.

Oh yeah, check the button battery that backs up the clock. It might
be dead or dying.

I've had machines with faulty (or even missing) CMOS battery causing the
Clock to stop in Standby but still not any loss of setup data.