I got a pre-built computer from Amazon, the HP 870-090 OMEN, that came with a NIVIDIA GeForce GTX 1080. It was a new PC, not a refurbished. I have been able to enjoy it a lot in the week I have had it but the last few days there has been a problem that seems to pop up. While playing FFXIV, with Twitch in the background, and Reddit!

I found that when I would tab out of the game, at the time it was in Fullscreen, that it suddenly made my whole screen pixelate. There were multiple squares with the RBG colors in those squares. The first time this happen HP self booted its bug report and immediately reset my computer. After that it worked fine, the yesterday morning it happened to me once again, me tabbing out of FFXIV (Fullscreen), but instead of the whole system rebooting the game crashed and the issue went away. I was able to immediately boot FFXIV without the problem happening again. My drivers are up to date.
My question is there any known issues of this happening? Is it a problem with me having the game in full screen and tabbing out? Or is there something wrong with the graphics card / driver? If it happens again is there something I should do, like screen shot/take a picture, to be more helpful?