KhakiHat

I would just find a CPU that is the same socket type as the A8 6600k(FM2 socket) and find a higher tier used CPU that you can buy for cheap. What country are you buying from?

I'd try and RMA the PSU

Assuming that is a 288 pin stick of RAM and DDR4, it should work fine.

PSU's are definitely not supposed to click like that

Could open up task manager to see what is eating up your resources

I just checked 580's on Newegg and they are priced above $500

I'd just take the performance hit with a lower end card for now, the GPU market is outta this world rn. If I were you I would wait for a lower priced market to buy a card that is worth your money and not unrealistically valued.

Is your CPU clocked higher than just a stock GHz? If so, try to let it run at a stock speed. You could definitely be trying to pull too much power, then it only being noticeable when your CPU kicks into high gear. i9 chips are well known to be power hogs. Correct me if I'm wrong but don't i9's have a dedicated GPU? You could try taking out your GPU and running a game based solely on the dedicated intel GPU(You would need to uninstall your GPU drivers and install the Intel GPU drivers to test this) just to see if the game will run without restarting your PC. If it continues to restart, then the problems doesn't stem from your 1080ti. If the problem is solved, then I'd still be willing to bet that it isn't your GPU still but rather a better argument for using too much power with GPU installed because i9's REALLY LIKE POWER.

How are your thermals? Are your drivers for your PC and GPU up to date completely? Edit: Worse comes to worse, you could always open your task manager and see what all is running and using up resources. Assuming you didn't buy any second hand parts, the PC should probably be fine hardware wise. Seasonic is known for making some of the best PSU's.

Which country is your purchase taking place?

Definitely odd. Are you running in v-sync? Does this happen in general or only when playing games or that game specifically?

If you bought a soldering iron it could be hot swappable. Chances are that keyboard is most definitely not natively hot swappable though unfortunately. Edit: A good way to tell is simple by trying to take out a key switch, not forcefully of course but if the key switch itself comes out then now you know its hot swappable and vice versa.

Would an iPad Pro ever be considered? They are blazing fast imo, plus they come natively with a touch screen, and now offer support for a keyboard and mouse.

Anti-virus on it's own can really bog down your system in my opinion. You could try checking your auto startup programs to see if something is running in the background and stealing resources. Checking task manager is my go-to when I feel my system stuttering. CCleaner is also a great tool.

I'd grab a fresh storage drive and a new PSU for better power efficiency if using it was a thought.

It works for SSD's and HDD's. It's basically like a tune-up software. Clears browser data, fixes registry errors, etc.

You could try a program called CCleaner as well, I've used it for years.

Is the location the PC is in a higher temperature?

You're not very likely to bottleneck a 2060 if you have that recent a generation of CPU. I think there is speculation of new NVIDIA cards coming out soon though, perhaps look into that?

What is your cooling situation like? Is there multiple fans inside of your case excluding GPU fan(s) or CPU block? If you room temperature is higher, that could also greatly influence how hot your PC can get and the rate at which it does.

Do you know what slots in particular you have your RAM sticks in? Like A1 A2 B1 B2? Are you able to boot into safe mode maybe? Or do you have a recovery usb for windows?

What is the resolution of the TV?

Curved or flat?

Do you prefer wired or wireless? I used the Logitech g602 for over a year and I had zero complaints. I even snagged it on sale on amazon for like 30 USD.

Have you considered maybe replacing the motherboard? That whole gen of motherboard for the AMD lineup was pretty shakey from what I remember. It's fairly odd that all of your components would all start having having issues around the same time even if they were semi-dated. I'd start with the most common link. Because you already replaced the PSU, I'd look into the possibility that your motherboard might be experiencing issues.