Then the cause is demand, not your equipment. Two separate kinds of demand produce the same symptom. Your local access network is shared with neighboring households, so usable capacity falls through the evening whatever your plan says. And on the delivery side, a live event draws far more concurrent viewers to one stream than anything else does, so a service with thin capacity headroom shows it there first. The two are distinguishable: local congestion degrades everything you stream, while a concurrency shortfall degrades one event while other content stays clean. Check a second, unrelated stream during the same minute and you have your answer.

Post-update regressions are a real and recurring cause that troubleshooting lists almost never name, because the standard advice is to update. A new Fire OS build or a new player version can change decoder selection, network timeouts or memory handling in ways that suit most hardware and hurt some. The tell is timing: playback was stable for months and changed within days of a version bump, with nothing else in the house changing. Test it by clearing the app's data and reconfiguring, or by installing the previous version of the player if the app allows sideloading. If behavior returns to normal, you have found it.

Then look at the HDMI chain rather than the network, because a stream that reaches the device intact cannot be a bandwidth problem. Refresh-rate mismatch produces judder that people reasonably describe as buffering, and match-frame-rate settings on Fire TV resolve it. HDCP handshake failures through a soundbar or receiver produce dropouts and black flashes. A tired HDMI cable or a port on an older panel produces intermittent loss. Move the stick to a different port, then to a different TV, then bypass any receiver in the path. Each move eliminates one link, and this whole sequence takes about five minutes.

Memory pressure builds quietly. The player keeps the visible channel list in RAM, background apps hold their own allocations, and cached data accumulates, all on hardware with little spare capacity. The pattern is gradual: playback that was fine a month ago now stalls after an hour, and a power cycle at the outlet restores it for a while. The permanent fix is to reduce what the device has to carry. Hide channel groups you never open, because a visible list past roughly 18,000 channels destabilizes players on its own, and force-close background apps. Then a weekly reboot becomes a habit rather than a rescue.