Desktop specs: HP Windows 8.1
AMD A8-5600K APU with Raedon HD Graphics 3.6 GHz, 8gb of RAM
Antivirus: Windows Defender
Issue: This only happens when I'm using data over Wifi (using a browser, installing updates, running a game/app that uses internet). Within 30-60 seconds the computer slows down (at this point the Wifi icon usually shows that it's disconnects), then screen freezes, and mouse freezes as well. After a minute a cyan screen with blurry moving white lines with appear, then computer reboots after another minute. Same thing happens in safe mode. However, if I'm using an ethernet connection or on Wifi without using online resources, everything works fine. There was also ONE instance where I was able to use WiFi just fine (to my surprise), but that was a 1 in 30+ attempts. All other computer/laptops in my residence can use WiFi without issue.
Background: Issue started last month (Jan) after Windows updates downloaded and installed automatically. I did a system restore to a point before the install and everything worked fine again. However, the next night windows ran automatic updates again... and I was unable to do another system restore (when I tried to access the same restore point I get an error message).
Things I've tried to no avail: MBAM scan, updating and reinstalling WiFi drivers.
Would appreciate any help!