Mac mini M4 Pro screen go black randomly

Hey there

I’m using Mac Mini M4 Pro (15.3.2) with LG C4 as main display through Ruipro optical HDMI 2.1b 3m cable at 4k@120Hz and i'm experiencing occasional screen blanking that lasts from 1-2 seconds. This is happening daily

I got Mac Mini since February 18 2025 and it was working fine in this setup until recently, I didn’t changed anything before problem started to occur.

I tried different display through HDMI connection, changed the cables, etc, nothing helped.