Apple TV - audio and video out of sync

This problem has been getting worse and worse. Now we are to the point of watching a show for 15 sec before it goes out of sync. Then after 30 min - the video freezes while the audio marches merrily on. After that, the video is difficult to take off air play. It also takes an inordinate amount of time for the video to buffer initially.
I don't know what version of Apple TV we have. We are streaming from iPads. All softwares are up to date.

Any help would be appreciated

thank you

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