Hello!

This is a crosspost from r/Roku but with more comcast-specific information added.

I recently purchased my first Roku TV, a 55" 6-series, which is allegedly compatible with Apple AirPlay over my wireless network. I'm having a good amount of trouble with AirPlay and I can't figure out what's happening. I will start with this the caveat that I am also new to AirPlay as this is my first AirPlay-compatible television.

I am running Roku OS 10.0.0 - which seems to have slightly improved the problem - and the phone is an iPhone 12 Pro Max running the latest version of iOS.

The very short version is that frame rates via AirPlay and quality are incredibly variable and there doesn't seem to be any rhyme or reason as to why. Frame rates and loading are more reliable using "screen mirroring," but image and audio quality is much worse.

A thirty-second video from my phone's camera roll will stutter, speed up, slow down, and occasionally totally freeze until the second or third time I play it, but even then it's a crapshoot. A five-minute YouTube video will immediately play in crystal clear high definition. A ten minute YouTube video will not load at all and will occasionally freeze the television's OS.

The TV is not hard-wired into my network, but speed tests on my phone and laptop routinely show me getting 500mbps in the living room wirelessly. When I run a "connection test" in the TV's OS, it says it's getting between 3 and 25 mbps, but I doubt this is the case because I have no trouble at all streaming in 4k from Netflix or Amazon Prime.

This massive variation in quality depending on the context in which I am connecting to the network suggests to me that there is some sort of device prioritization or firewall that is bottlenecking my ability to use AirPlay.

Are there settings I can check/fiddle with within the Xfinity app?

I have put in a call to Comcast and someone from the "advanced support team" was supposed to call me back last night, and they didn't, which is fine, except now they want to send a technician out, which seems like a waste of everyone's time until I've explored other options.

Any thoughts as to what's going on here?

Thank you!