Hello.

Got this issue where the game is starting to lag on TV (on PC monitor it's smooth) for ~7seconds, then the TV goes black for 2 seconds, and afterwards the game is smooth on TV. For couple of minutes the game runs smooth, then the lag process repeats.

I don't stream demanding games, Lego Batman, Lego City Undercover.
I limit the games to 60fps and set v-sync off (ingame and AMD Catalyst). From research that fixed the issue for others.

PC:
AMD Ryzen 7 7700X
AMD Radeon RX 7800 XT
32 GB

TV:
Smart OLED Philips 55OLED706/12, 139 cm, 4K Ultra HD

Google Drive with Screenshots[drive.google.com]

Any suggestions what should I change?

Thank you very much.