AppleTV 4K freezing in playback of 4K iTunes movies

TV os 11.1 I have been getting intermittent freezing of playback with the swirl icon with 4K films even when they have been downloaded to the 64 AppleTV 4K the only recourse is to restart the Apple TV and when restarted the movies app has lost the place it had reached in the film meaning a lot of siri advance 5 min to to near the storage point

my data is 5/50 gigabit wired ethernet and there is no problem with it when this happens

is there any thing else I can do other than restart when this happens?

anyone else seen this problem?