Streaming quality is decided by the weakest link between our servers and your screen, and that link is very often inside your own house rather than on your line.
A 4K stream needs a steady connection more than a fast one. If your TV is two walls away from the router, a cable — or a router moved into the same room — will do more for the picture than doubling your line speed.
Most routers broadcast on 2.4GHz and 5GHz. The 5GHz band is faster and far less crowded; put the TV or box on it and leave the 2.4GHz band for phones and doorbells.
If a channel stalls while others play normally, it is almost always the box's buffer rather than your account. A restart clears it. If it persists, tell us which channel and when — that is the detail that lets us find it quickly.
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