Your Zwift Play + ATV issues may be a coincidence: the latest version of Zwift for ATV has some serious bugs that have resulted in the game locking up.
I’ve experienced this and I do not use the Companion App for bridging, nor do I own a Zwift Play.
EDIT - per my reply below, I started a thread on the issue: ATV v.1.44.0 bugs - choppy frame-rate, lockup, possible video screenshot correlation