XPS 15 9500 random restart, no charge

My XPS 15 9500 started acting up in March 2024.

Symptoms:

• random restart, no error message
• charger not recognized after reboot

Temporary fix:

• shut down with charging cable unplugged
• plug cable during reboot as soon as the Dell logo comes up on the screen

March 2024 was the first time it happened. Reached out to Dell and they had me run diagnostics and found that the battery was nearing the end of its life (2020 model). 

Fix:

• Send laptop to Dell for diagnostics
• Replaced motherboard and battery
• Released and shipped as tested and working

It lasted a full 2-3 days before restarting again randomly. 

Contacted Dell support again and they told me to ship it back to them for diagnostics.

Conclusions:

• Tech could not replicate issue
• Sent it back to me, and added to the ticked "Per your instructions, we have sent your system back to you unrepaired". Guess what, I told them specifically in email and over the phone to keep the laptop for a few more days to diagnose it better instead of sending it back "unrepaired".
• Laptop got shipped back and worked fine for a total of few hours before restarting.

I am currently resetting Windows for what it seems like the 5th or 6th time. Read something about the fingerprint reader driver being an issue, so I won't set that up this time and hope for the best. There was also a thread about disabling screen refresh under Intel control panel. I'll try that if the fingerprint fix isn't fixing it....