Loosing office activation after sleep, and after restart it's activated again

Hi, something very strange is happening in my computer:

Every time I suspend or hibernate the computer I loose Office 2010 MAK activation. Office says there's been hardware changes. But if I restart the computer the activated state comes back.

Anybody has a clue of what is happening? Thanks!!

 

Thanks for your answer!!!
This is an old computer and there is no BIOS updates.
I think this began to happend when I shrinked the partition to add an extra partition at the en d of the disk.
But I wonder what hardware change can detect office after sleep?????

 

There is no sleep options in my bios. This is an HP laptop.
It's the same: after suspend (S3) or hibernation (S4), activation is lost.
After restart or power off (S5) activation comes back.