Why is my TV screen flickering when my Xbox Series S is connected to it?

So I have a Skyworth TV (supposedly 4K but only supports up to 1080p) and I have my Xbox Series S connected to it. Recently the screen has started to flicker when the Xbox is connected to it, now I have a home theatre system that’s connected as well and my cable box is connected to it. It seems that the Xbox causes the screen to flicker when the cable box is being used even though the Xbox isn’t in use (its on but the source is changed to the cable box). This issue is with the Xbox connected directly to the TV and when it’s connected to the theatre system.

The cache was cleared and im using the HDMI cable that came with it.

:)