CPU severely throttled within 5-10 minutes of heavy workload and stays like that for a long time
Macbook Pro 16 Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz 2.40 GHz, AMD Radeon 5500M
I'm not sure if it's because of overheating but something seems wrong as of recently - after only minutes of heavy workload the laptop gets quite warm and the CPU throttling kicks in severely, i.e. from 2.4Ghz to 800Mhz. I ran a CPU benchmark and it gets only 3500 out of vs average 15800 and the whole OS becomes extremely unresponsive (much worse e.g. than my old Macbook Air).
This state continues even when the temperatures come down, i.e. now CPU cores are registering 55-60C and it's still running at 800 Mhz, very slowly.
I just ran diagnostics and nothing is showing up.