What’s the Best Way to Check My GPU and Other System Health?

I've been facing some frustrating issues with my computer for the past few months. My GPU is less than a year old, so I'm suspicious it might be the cause of my problems. Lately, I've had games crashing or freezing (like Hunt Showdown and The Finals), and my system has been running really slow. Task Manager sometimes freezes and acts weird, plus one of my monitors has been flashing or showing color problems. I've already checked that my GPU drivers are up to date, but the issues persist. I'm starting to wonder if it could be an issue with my GPU or RAM going bad. I'm running Windows 10, and you can check my parts list here: [PCPartPicker](https://pcpartpicker.com/list/4Rbskf).

Additionally, I'm not sure if this is related, but whenever I turn on my AC, it seems to activate my audio mixer's lights for a moment, which makes me think there could be a power surge happening? Here's the audio mixer I'm using: [Amazon Link](https://www.amazon.com/dp/B0BZP95YB5?th=1) and I have everything plugged into this power strip: [Walmart Link](https://www.walmart.com/ip/GE-10-Outlet-2-USB-A-1-USB-C-Surge-Protector-with-8-ft-Designer-Braided-Extension-Cord-Black/332137560?classType=VARIANT&from=/search). Unfortunately, I can't plug my AC into another outlet.

Also, I tend to keep a lot of tabs open in Firefox for my projects, but that's been my routine for years without issue. Recently, when I check Task Manager, sometimes the text looks corrupted and doesn't respond properly when I try right-clicking on it, which I don't recall ever happening before.