Every time computer wakes up, or launch, or close a game in full screen appears 3 or 4 times, a noise test screen during 2 seconds, then normal screen, and go on..
First instalation in windows 10 with windows drivers didn't appear it, but when I installed oficial AMD drivers problem came.
Motherboard: Gigabyte B450M DS3H
Processor: AMD RYZEN 5 3400G
Memory: 16 GB Corsair Vengeance LPX DDR4 3000 CL16
Monitor: HP w2216v (VGA input using adaptor DVI>VGA)
OS: Windows 10 Pro
I added a similar screen image as i have...
Hope you have all info you need.