Apple TV Streaming App has stopped working, but all other Apps are working

Is anyone else having this problem..? When you launch the Apple App it says it “Couldn’t Connect to Apple TV” Check your internet connection and try again.  You try again and get the same message, and there is nothing wrong with the internet connection because you can stream from other Apps such as Netflix and Prime. Have tried restarting the TV box but get the same messages, also tried on my second box and get the same error message…