ACPI Timer

Is there someone reading this who knows for sure that the
Power Management Clock updates the system time in a Windows
2000 ACPI uniprocessor PC?

Starting last week about every other day, the system time
on my PC intermittently counts an extra one to nine seconds
in a minute. The hardware real time clock display is
correct on the main bios screen.

The only symptom of this problem I've noticed is that the
QuickTime Sorenson decoder will play the audio stream out
of synchronization. All the other decoders will playout ok.

I believe that this problem is heat related. The
motherboard temp was 33C. The CPU temp was 57C.

Thanks,
Mark