Buffering, for my AppleTV 4K, began after AppleTV+ appeared on my HomeScreen in June 2023.
I discovered I could Select AppleTV+ Menu actions once I 'subscribed' to AppleTV+. But, Buffering DID NOT occur while using AppleTV+.
Only the 4 apps I'd used for several years were buffering: Paramount+,
PBS, Prime Video and the YouTube
free app ALL Buffered!
Reading messages from others on
discussions.apple.com, revealed
AppleTV+ is NOT a app, but is part
of the 'AppleTV 4K OPERATING SYSTEM'.
I've Turned Off every AppleTV 4K SETTING I didn't need, then OffLoaded in (Settings, General, USAGE, Manage Storage) the
3-apps I was not using. Buffering still occurred, but not as often AND for
Shorter time.
Eventually, after talking with a Apple
Help Agent, he agreed to send our
discussion to Apple Engineering to
question: Does AppleTV+ Presence
in my AppleTV 4K Operating System
create a 'constant data load' due to
AppleTV+ constant programming
updates?
It's been just over one week now.
I've received no response. So, I followed advice from 'discussions'
here to increase my BandWidth.
My increase from 50Mbps to 60Mbps 'has' reduced Buffering.
Now Buffering interruptions are
infrequent and very short.
It seems my modern equipment:
SONY 4K TV, Up to Date Ethernet
and HDMI Cables which I Tested with my Klein Cable/Port Tester, AND 60Mbps Signal aren't good enough for AppleTV 4K Streaming.
It might be time to find better service
and equipment elsewhere.