My mom and myself are having the same problem and none of the suggestions in this thread work for either of us - she lives about 10 minutes away from me, uses a different TV brand, and different speed package but same ISP. Mine is to the point where it’s buffering for about .5 seconds every 3 seconds and I just paid $75 to watch a show that is currently essentially unwatchable. It also seems to be happening intermittently, which leads me to believe the issue isn’t on my end. (Ex. it’ll work fine for ~5 minutes and then return to the buffer pattern for ~3 minutes and repeat.)
This has only been a problem recently and I see others in the same boat as me. I don’t want to be rude either but I also don’t understand why no one is willing to accept the possibility that this might actually not be a user-problem.
Also, FYI - I’m using the Apple TV app, I have a router in every room of my house as I’m a gamer & streamer and my wife works from home as the CMO of a Digital Marketing company (hence the need for unproblematic internet), and the home network I’m currently using is testing at 700+ mbps (my TV won’t reach for LAN and the problem hasn’t bothered me enough to buy a longer cable until now).