Brilliant thank you, I'll do that.I would install this EC FW update tool first, then update to F40 first if you are on F31. Then after that it appears you should be alright to go to F51.
I watched a video about that when trying to find a solution for the issue - but I'm not sure it would have come out with an answer of "Your chipset driver is out of date" would it?LatencyMon install and reset pc then run.
Cheers both