Thanks Roel,
For some time now I have had the resource monitor open ALL the time while I am using cubase, and most of the rest of the time too. The glitch only happens when cubase is running, and, according to the ‘orange line’ is related to cubase. However, I have been looking at other processes, and couldn’t find any that peaked at the same time. I will give that process monitoring tool a try, and see if I get any further.