Apple TV+ locking up

Anyone else an Apple TV+ subscriber and tried watching from the browser (tv.apple.com)?  When I try to watch a show full-screen, the video pauses and locks up after a while (less than a minute).  I have to exit full-screen to get it to start playing again.  It also sometimes causes the entire browser to lock up and I have to close and restart it.

I haven't been able to reproduce this in other browsers, including regular Chrome.  And it doesn't happen with other streaming services (Netflix, YouTube, etc.).