Set up - 
 
X299 Dark mobo
10980XE processor
1200W ROG Thor PSU
MSI triple RTX 3090 
64GB Corsair Vengeance ram
bios 1.28 
 
All plugs for PSU power checked on board. PCI and CPU plugged in
Fully watercooled - 50 degree max 
 
running Windows 10 pro
 
strange issue with build, I have checked the PSU and swapped out. Checked CPU & GPU again swapping with others and it all points now to Mobo issue. 
 
The PC can stay on and play a game like New world for hours also run time spy bench and stress test. Every now and again when starting a game, opening a window / web browser the screen goes, leave it and sometimes freezes or sometimes will reboot. I have checked events and get Kernel-power code 41 (63). is there any way to drill down further to the issue?
Driving me crazy. May go 2 to 3 times on the bounce and then stay on for hours.
 
There is some slight bend on a pin on the socket - this is me being OCD, its not major but when you glance down from different angles you can see one slightly out. Could this cause an issue like the above when at times its rock solid? I tried to get on a pic but doesnt show.
 
Any help would be greatly appreciated TIA

Adenix
Set up - 
 
X299 Dark mobo
10980XE processor
1200W ROG Thor PSU
MSI triple RTX 3090 
64GB Corsair Vengeance ram
bios 1.28 
 
All plugs for PSU power checked on board. PCI and CPU plugged in
Fully watercooled - 50 degree max 
 
running Windows 10 pro
 
strange issue with build, I have checked the PSU and swapped out. Checked CPU & GPU again swapping with others and it all points now to Mobo issue. 
 
The PC can stay on and play a game like New world for hours also run time spy bench and stress test. Every now and again when starting a game, opening a window / web browser the screen goes, leave it and sometimes freezes or sometimes will reboot. I have checked events and get Kernel-power code 41 (63). is there any way to drill down further to the issue?
Driving me crazy. May go 2 to 3 times on the bounce and then stay on for hours.
 
There is some slight bend on a pin on the socket - this is me being OCD, its not major but when you glance down from different angles you can see one slightly out. Could this cause an issue like the above when at times its rock solid? I tried to get on a pic but doesnt show.
 
Any help would be greatly appreciated TIA

CPU Pin??? If you can, try another CPU, bent Pin can become problem but you should try to fix it. And kernal power error 41 or 63 are leaning towards to PSU.

Adenix
Every now and again when starting a game, opening a window / web browser the screen goes, leave it and sometimes freezes or sometimes will reboot. 

The screen goes what? A bent pin isn't good.

Guess you’ll need to replace the board, or fix the bent pin to see if that will help correct the problem since you’ve tested with multiple cpu, gpu & psu’s. Definitely check the ram before doing the board swap.