XPS 7590 issues

Hello,

I have a dell xps 7590 (OLED) with an i9-9980 HK, NVIDIA GeForce GTX 1650 and 16GB of Ram.

I am facing a weird issue.

1) The laptop may run fine and when I choose to restart it shutdown and never comes back.

2) It may stop randomly on windows to ouput on screen (as if the drivers crash or the gpu or I do not know something else) and after a minute or less it shuts down

Reviving the laptop is a pain.....  I may have to unplug the battery or just plug and unplug the power and in many cases it may never come back and I have to wait either many hours or a few days.

What I have done:

1) Changed thermal paste and the thermal pads (temps are between 55-89 degrees Celsius)

2) Cleaned up the laptop thoroughly so there is not blockage on the fans which may create thermal issues.

3) CMOS reset

4) Tried with and without the battery

5) With the battery charged tried with the power cable and without

The laptop has dual boot with Windows 11 Pro/Ubuntu (if that matters)

I am at 1.35 bios version. At some point I saw that Ubuntu updated the bios on 1.38 but I downgraded it because these issues started when this update happened. Eventhough I downgraded to 1.35 nothing changed. (Honestly I tried to look for 1.38 online to update the BIOS/UEFI version again but I could not find anywhere. Weird honestly....)

I have heard other people mentioning similar or the same issue some said it was the motherboard, others the BIOS chip on the motherboard, others mentioned temp issues and others the small board that is responsible for the power on the top left corner where the power cable is connected.

Since these issues happened the laptop has entered quite a few times to recovery mode for the BIOS. I tried to force it also with these combo keys (alt+esc or something like that). Also now if it crashes it requires me to update the time and date on the bios/uefi settings.

Does anyone have an idea what may be the issue?

Thanks.