iPad streaming on Apple TV stops all the time

Hi all,

Every time I try to stream a movie from my iPad to the Apple TV, the streaming stops every couple of minutes. Any idea what the issue could be?
iPad Pro up to date iOS
Apple TV HD (4. Gen) up to date tvOS
Infuse 6 pro up to date version
Movies 1080p H.264 MPEG-4 Dolby Digital 5.1

Could it be die tongue Dolby Digital 5.1? From my understanding Apple TV HD supports DD 5.1 so there shouldn’t be an issue.

Thanks for your help!