Airplay will not fast forward or rewind a streaming video?

Attempted many times to use Airplay with a Samsumg 8 Smart TV. Samsung 8 allows only Airplay from an Apple device, not screen mirroring.

I've found a streaming video will play for 30 or 40 minutes, then lose the connection to the TV. (This has happened repeatedly. I've checked all the settings on the TV, iphone, and Airplay. They are all set correctly. There was one time out of maybe a dozen where Airplay played the entire hour of the video on the Samsung TV, so I know it is possible.)

When I connect again, Airplay will not fast forward to the place in the video where it broke off.

Despite displaying controls for fast forward, is Airplay simply unable to do this? Or how can I fix it?