Interesting. Glad 7.0.2 solves it for you. I can reproduce the issue with 7.0.2 on AppleTV with all OTA channels, seems like clockwork, right at the 60-70min mark of watching something live.
Just had the problem again, submitted log. Any ETA on a fix?
Thought it was just me. Experiencing the exact same thing. Will submit diagnostics next time. Takes about an hour to and hour and half to start experiencing the problem. AppleTV 4K tvOS 26.4. HDHomerun flex duo, direct stream.
Submitted diagnostics. 4/13 8:34am CST
Saw there was an updated beta this morning, so updated to 4.13.409. Still seeing the issue, all fine until just after 1 hour of constant live OTA. Submitted logs at 08:20AM pacific time.
Maybe a question for the devs, is there any chance something could be corrupted that would require a complete uninstall and then clean reinstall of the beta? Or do updates on ATV not work like that?
Please try the latest Testflight beta for more logging that will hopefully give us a lead on what's happening.
No, this would not be needed.
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Logs submitted 8:51 am CST from beta.
Submitted logs after live tv started lagging around 9:45 am ET
On new beta
Submitted logs at 8:01AM PDT.
The same dropped frames that start after ~70 min of continuous playback…assuming that’s the best way to describe it. I guess another way to describe it is it looks like it goes down to like 10fps, and the audio is way off too.
Please try this latest Testflight and submit diagnostics when it happens again.
Just now noticing frame rate decrease and audio out of sync. Submitting logs. 5:20pm CST. Newest Beta for ATV.
curious, do you have any HomePods, airplay or any type of speakers that are bluetooth or airplay? ive noticed that behavior happen often for a very long time, a quick seek back fixed the frame drop and audio most of the time, or worst case is to kill the app.
ive always see when connecting AirPods, the video skips ahead while audio catches up.
I think it might be the audio driver but I have no evidence, nor does it bother me too much anymore (you'll learn that with this software) and i doesnt happen anywhere else nor does it happen to me on a client without blu/airplay speakers.
just curious what type of audio output you guys have.
Probably not related to any wireless audio. I have one ATV connected via HDMI to a Yamaha receiver, and another connected via HDMI to a Sonos soundbar. And it's happening on both.
Also of note, one ATV is using ethernet and the other is WiFi, so I think we can eliminate network connection type as a possibility.
what about match frame rate and match content on the Apple TV and in channels? maybe its a EDID thing. I say that because ive seen a lot of display issues on my tv with QMS when changing frame rate and dynamic range.
try forcing one dynamic range and frame rate to see if it happens?
no idea, im probably chasing ghosts but who knows. 
Logs submitted at 7:46AM PDT using 4.14.1914...Thanks!
As a point of reference, I have a friend who shares my antenna and ChannelsDVR and connects remotely using her Apple TV 4K and using port forwarding on my router to reach my ChannelsDVR.
I had her check the Today show this morning which she was watching live and she stated that after 2 1/4 hours of live TV the audio and video were still in sync. She had started the TV well before the Today show came on.
Hence it looks like the problem only manifests itself when the Apple TV 4Ks are local to the ChannelsDVR LAN network with the HDHomeRun device(s).
Please go to Settings -> Playback -> Advanced and change Deinterlacing Mode to something other than Hardware and let us know if that resolves your issue.
We've noticed all of the people who are having trouble are playing interlaced content. None of my local channels are interlaced, which could explain why I haven't been able to reproduce the issue locally.
Just happened again, live OTA, logs submitted. ETA for a fix?? Thanks