desperate for help

Game will randomly freeze while on siege only started happening recently doing things like ctrl alt tab doesn't help as its completely unresponsive until you shut it down by holding power button. Only happens on that 1 game ( so far )

So i built my new PC about 5 months ago and I spent a lot of money on it and recently have been having crashing issues where I’ll be fine at some times and not crash for a while but the second I crash once it crashes again and again. I think it could be my CPU which is a Intel 13900k I know...

So my landlord recently moved out of the country, and as a result we had to get our own contract with the ISP. A few days later they said it was up and running and our smart TV did indeed get Internet again, but both Wifi and wired connections to either the network switch or the router are dead...