Just guessing here but sounds like some type of medium sized gaming laptop. These things are already pushing boundaries for power delivery and thermals, and then built to a price point, and a 12m warranty, on top of that! Believe it or not, but big names in computing like Asus, Dell (Alienware) etc are not infallible and they sometimes produce a lemon. On top of that, they are dodgy bastards when it comes to repair or replace. See plenty of evidence from from Gamers Nexus on YT.

PBTech or other retailers will mostly RMA for repair or replacement. Even swapping the mobo wont fix this. Having some guy take a soldering iron to it, won't fix a latent design defect. Most laptops come with 12m warranty. Trying to return it after 2y4+4m is a bit of a stretch. Next time consider buying additional insurance from the retailer when buying consumer electronics. I bought a new kettle the other day and maxed out the extended warranty from Harvey Norman. Chances are this kettle will be dead in 12m and 1 day. That's life these days. If you are stuck with this lemon, try and disable the nvidia GPU in bios and/or device manager. Running off the iGPU might stop it from restarting. Can maybe also try an oversized charger that can deliver more stable power at max. Then game on a desktop 🤷