I have a new Dell G3 with an i5 9300H coupled with a GTX1650.
It was running great until I was playing Payday 2 and suddenly I notice a huge fps drop I downloaded Realtemp and noticed that the cpu is at 100 degrees celsius i closed the game immediately, and that's when my problems started I reopened the game after I let my laptop cool down and instantly the cpu hits 100 degrees again! I tried to open another game and still the problem presist... Basically now any cpu or gpu intensive applications makes the cpu hit 100 degrees.
Note: The cpu instantly goes to 100, its like a switch and the laptop is new and never had this issue with cooling before and never encountered thermal throttling before either.
All help from you guys will be deeply appreciated and sorry for this horrible english.