Should I change some of my pc components? (strange GPU problem)

Hello everybody. Many years ago in 2012 I built my first PC.

CPU: i7 3770K
Motherboard: Asus Maximus IV extreme rev 3.0
Graphics Card: Gtx 680 (4GB)
Ram: 32gb DDR3 1333mhz
Storage: 120 SSD, 3TB HDD
PSU : 1000 W

I use this pc for gaming (obviously) and also other stuff like graphic design video rendering etc.
One month ago a friend of mine convinced me to get into mining bitcoin.So i bought a GTX 1080 TI. I still use my old GPU with my 2 monitors, the 1080 just sits in it's slot, mining.
Everything was fine for a couple of days, if not a week. After that my old GPU started to act strangely. I have frame drops in games, my pc freezes / lags (both audio and video) for a couple of seconds. The best way to describe it is that it behaves like the "Nvidia display/kernel mode driver..." error. Sometimes i have to restart my PC because the video and audio are just awful.

Side note: i also had the kernel problem before with the GTX 680 and after many "solutions" to said problem I managed to fix it.

I also had something interesting happening with my old GPU. After a freeze/lag/whatever artifacts appeared on my screen (only one of them) and by artifacts I mean those strange green (dead-like) pixels. If i tried to select the pixels or watch a video, they would go batshit crazy all over my screen.
I decided that maybe it was time to reinstall my windows. and so did I. The artifacts disappeared but the rest of the problems are still there.

Example of performance issue
I am playing PUBG (installed on the SSD) for some time and:

GTX 680: before, i had a constant 60 fps but now when the problems appeared i had even 16-25 fps sometimes it's stable at 45-55 fps (the settings are the same as before)

GTX 1080 TI: I thought that there must be something wrong with my old GPU so I tried the new one. Surprisingly, i got only 90-110 fps (on FullHD) and sometimes it went as down as 40fps.
Ok, was better but I saw benchmarks of my new GPU going 80-100 in 4K so...

Now my questions are : All of this is happening because of the new GPU? Is my old GPU dying? Is it because of my other components? Do i have to build another PC? etc.
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