Razer Blade 15 thermal throttling and crashing overnight.

Hey guys, my razer blade 15 advanced (2019 - 2070MaxQ) has been working fine for about 2 years now. But seemingly overnight its become literally impossible to run any games without it thermal throttling into oblivion (e.g csgo goes from 300fps to 25) and the system crashing until I restart. The laptop now also runs very hot at idle compared to what it used to be (around 45 degrees to 65 ish). At first I assumed there was dust but I cleaned out the fans and grill less than a month ago and its still clear. I though it may be drivers so I reinstalled everything (even BIOS updates), but nothing changed. I even reinstalled windows and ran antivirus scans to no avail. Its out of warranty so I've gone as far as to replace the thermal paste at a computer repair store (they did it for pretty cheap). But the results were the same. I tried running the EVGA precision X VF curve tuner but the clock speeds eventually dropped down to their minimum (300mz) as the gpu reached 99 degrees and the system crashed. Any clue as to what to do? Or is my motherboard/ gpu/ cpu failing