beachintechThere's sand in my tool bagPremium
Usually noise / ingress/ low signal is what will cause tiling / freezing. A bad cable box can also cause this on the TV it's connected to. You could take your box into a local service center and swap it out for a new one before your appointment to see if that corrects your issue. Usually a bad box will only effect the TV it's on.
If you are seeing these issues on Analog channels without a box, then there is an issue outside your home, most likely in the head end. Someone will already know about it and be working to correct it. That sort of thing is monitored all the time.
Tech at the Beach.
I speak for myself, not my employer.