I have an 'Hisense LTDN46V86US HDTV' connected, it works fine.
When I connect an 'eMachines E182H' monitor as a second monitor (with a DisplayPort to VGA adapter), the screen randomly black screens for 1-2 seconds. Sometimes it happens right away, sometimes it takes a few minutes, sometimes it takes a couple hours before it starts happening; once it starts it usually keeps happening over and over. Sometimes I am not running any programs, sometimes I'm running Google Chrome and/or VLC Media Player, sometimes playing Call of Duty and/or VLC.
When I connect my 'Samsung SyncMaster 203B' monitor instead (using the same adapter), it works fine.
The 'eMachines E182H' monitor works fine on my old computer.
ASUS ROG STRIX B450-F GAMING ATX Motherboard, BIOS 3003
AMD RYZEN 3 3200G with Vega 8 Graphics
Memory OLOy 16 GB (2x8 GB) DDR4, 3200 MHz
Windows 10 64-bit
DisplayPort to VGA Adapter is: