laptop display flashes uncontrollably

Hi Guys,
I have a laptop coming in for service with a bit of a strange (at least to me) set of issues.
During running windows 10 (current updates) the screen will begin to flash repeatedly then will go blank.
This can occur after 5-10 minutes running or after hours of running.
There is nothing showing on the screen after it goes blank. restarting the OS temporarily resolves the problem until next time.

This typically happens when using MS office Word or Excel.

Thanks!