Question Graphics Freeze

[rocky28965]

I am having a problem with my gaming system.
I've been running Truck Sim faultlessly for a couple of years.
Recently when I run ETS2, I am having intermittent graphics freezes for about 6 seconds, then back to normal again.
I’m saying graphics because the audio isn’t affected.
Intermittent because there might be several in fifteen minutes or none for an hour or more.

System is:
Asus TUF Gaming Z490-Plus.
Intel i7-10700k
Corsair 2x16 GB DDR4 3200
Asus RTX 2080 Super
OS Drive is 500GB M.2
Game drive also 500GB M.2
Data drive is a 500GB HD
OS is Windows 11 24H2
Gaming monitor is Asus PG278QR
I use a Moza Truck wheel with H shifter, plus Saitek side panel.

This system is only used for gaming, so no other programs are running in the background.
However, I do run Fan Control V214 and have it open on a second monitor.
When these freezes occur, the temps are well within range.

I have the latest Bios and drivers.
OS is up to date.
I've run a memory check and anti-malware.
I have run tests on all 3 drives with HD Sentinel.
I also run tests with SeaTools and Crystal Disk Mark.
All the tests gave good results.
I have also re-seated the graphics card and memory.
None of the above made any difference to the problem.
This freeze also occurs in The Bus, but is not as noticeable.
At this point I have run out of ideas.
Any advice or suggestions would be appreciated.

Thanks