Hello, I just got my new TCL 65C635. I know it is on the cheaper end of spectrum, but I got it at very good price. I'm satisfied with everything basically, except one thing that I encountered today.

As I was watching IIHF World Championship (Ice Hockey) I noticed very brief stutter/judder (can't tell the difference, I'm noob at these things) like every 5 seconds. First I thought it was somehow related to sports, but I tried switching channels and I didn't notice it on any non-sport channel but also not all sports channels had it. It is subtle, but noticeable and irritating. No stutter/judder on Netflix, HBO Max, XBOX Series S or any non-sport channels. I have two apps that I'm using for my TV channels, I'm not gonna name them since they are both only local where I live so you've most likely never heard of them.
I tried playing around with all display/picture settings but with no success.

Does anybody have experience with something similar? All advices are highly appreciated.

Thank you in advance!