I don't have anything installed other than 120Hz Storbed but all modes like 60/100/144 show in the list but when choosing any it won't do anything just keep 120Hz Storbed, weird bug
I got something similar in my VG248QE, Vega has it too in 1 of his 3 setup.
It can happen randomly but not too often just for 1 sec goes black n back, no idea what's this vega doesn't know either just cuz it happens so rarely I'm not worrying tho