Issue with Sky after using PS5

[Pidge1882]

Sky works fine until my husband has been playing on his PS5.  When he tries to go onto Sky we just get a black screen, the Sly Box is still lit as on.  He can get it on a tiny screen but not full screen.  The only way tp get the TV showing Sky again is to pull the HDMI cable out and reinsert it, then all is good again...until next time🤦‍♀️.  Any help gratefully received.