Computer reboots when playing games

[H4z3]

My Omen 45 L With Ryzen 5900x and RTX 3080 ti is intermittent rebooting when playing games.

Sometimes can play a game 20 minutes and sometimes 20 seconds. Then PC is rebooting.
Nothing in event viewer except for "your pc was not turned of correct....".

Latest drivers on everything including chipset, bios, firmware and Windows update.

No hardware errors on diagnostics tools from HP.

Has reinstalled from clean media as per recommendations from HP Support. Used windows media creation tool. 

Problem persists. Tried different drivers, reset bios to default, 

PC is just a couple of months old. Tried refitting memory and GPU. No difference.

Temperatures is fine in Omen Gaming hub.

Guess its a GPU or PSU failure.

Just wanted to check if someone has experienced the same problem? And what was the solution for you in that case?

[Prométhée]

hi

If the computer restarts, it's usually when it overheats.
were you able to read the temperatures in real time?
I did not check how the gaming hub works for this
if you can see the maximum temperature at a specific time?

if the computer restarts with suitable temperatures, during the game!
it can actually be a loss of power supply, gpu problem etc.
not normally possible to test without gpu, it would be necessary to be able to test it in another computer, it can help, but will not necessarily help to identify the failure
to see if the test is done with a game that is not very greedy, computer not very busy..
in any case, if you are under warranty, depending on return to seller, / contact hp directly