That sounds like a HDCP handshake failure. It's well discussed and if the usual doesn't clear it up then get Samsung on the phone next.
The usual is to power down everything. Then remove the AC then the battery (laptop models only) on all thing and wait 10 minutes for the HDMI chips to reset.
Apply power and try again.
It's a known issue and well discussed so I'll stop here.
i have Samsung S22C350 , my graphic card is , Radeon R7 260, connected on HDMI, Few times on half hour, my monitor turn of , and black screen i see, after that works normaly! but only for 1 second, he turn off, why? what i have to do?