Apple TV 4K keeps disconnect mirroing with Iphone XR

Hi,

I usually do mirror between my iphone XR & apple TV4K. First I'm excited because I can now watch videos from the small screen of my iphone on the big screen at home. However I feel then disappointed because apple TV keeps disconnect after a short period of time 5 min, 10 min, etc.

I wire my apple TV4K with the router therefore my internet connection is really stable. I use the same apple ID for both my iphone & apple TV4K. So I can watch shows, videos & music very smoothly on the apple TV4K; But I always have issue with the mirroring function on the apple TV4K.

Please help!

Edward