My Helios 300 PH317-51-722A shutsdown when plugged to AC and running games

Buddy, I was talking to someone and told him about the issue... he said to try using MSI Kombustor and stress test GPU and CPU I told him I have tried furmark and it worked fine and never crashed but I still tried Kombustor and suprisingly my system crashed with this app .. and send him the screenshot before the crash and also send him the video of what happens when I try to boot so he said this:
"Unfortunately this is a hardware issue you have. Let me explain: your GPU core is running normally and within the temperature spec it's designed for, but there is likely a faulty voltage gated transistor on the motherboard that's cutting off power to your CMOS chip when the GPU temperature rises.My guess: this is why your system runs fine for 15 minutes, but as electrical resistance builds up along the GPU power delivery pipeline, your system loses power because of a bad transistor(s) shorting out. Next, you can't restart for 5 minutes because your system is completely dead and the overvoltage on this transistor is preventing the CMOS restart until there is an eventual current leak and voltages along your pipeline are normalised. Because your CMOS was tripped, the system hard resets the BIOS after 2 boot attempts(which also resets your time and date) and then boots up normally. Your system will run for a bit longer if your GPU temperature is reduced but it will eventually shut down. Running on battery, the GPU was power throttled so the power relay was not getting overloaded.On mains unfortunately you will always have this issue.To cut costs on a 'budget' laptop acer has made compromises elsewhere with lower quality motherboard VRMs and other components.
Solutions:
GPU replacement(risky and not guaranteed to solve your problem).
Motherboard repair is always worth a try but again you need an expert for this.
Motherboard replacement is preferable as you can have the same issue even after repair,but it'll be a bit expensive. 
Take your laptop to an authorized Acer reseller after the lockdown eases to get a full diagnostic work up. 
I hope this answers your question."