Airplay dropping after ~2 minutes

Recently, airplay from my iOS devices to an apple tv ha s started dropping after about 2 minutes of play time. It happens with both youtube and vimeo and both my phone and my wife's phone. My setup is:

Apple TV 4th gen w/ tvOS 10.2.2

iPhones with 10.3.3

Ubiquiti EdgeRouter X 1.9.7 hotfix 2 (also tried 1.9.1.1 with same results)

2x Ubiquiti Unifi AC Pro

2x LinkSys LGS116P switch

It doesn't happen 100% of the time but once it starts happening, it happens quite consistently (which makes it easier to try different things). I've tried rebooting the router, the APs, the phones, the apple tv, and the switches without any improvement. I've also tried removing one of the APs but that didn't help either. I've captured packets on the ERX when it happens and it looks like a the apple tv sends up a bunch of resets (see attached, 10.0.1.77 is the apple tv)?

It doesn't happen when playing videos directly from the apple tv, only when airplaying from a phone to the apple tv. It's definitely annoying and it didn't happen a month or two ago.

Has anyone else experienced airplay dropping after about 2 minutes before? Any suggestions on what I can try?

thanks!