Gemini and my TCL 4K TV no longer getting along

I am having a really weird problem and need help. My Series 6 is a RokuTV.

I have connected to my TV:

AppleTV 4K -> HDMI 1
DirecTV Gemini Box -> HDMI 2
SONOS Beam eArc HDMI

Yesterday, my box for Gemini started to glitch out and reset every few mins. Would just essentially soft reboot. I reset it, still does it. Okay, bad box. Took another box known to be good and hooked it up to the TV and it resets itself over and over again just like the other one. Only thing in common now is the TCL. I've tried multiple HDMI slots, and am going to experiment with cables today, but this has been working just fine until the past few days. I suspect a firmware update or something that is causing data sent over the HDMI to freak out the Gemini box.

Neither box does this on another TV in our house. I don't know what the TCL could be doing to make the box reset, but it's clearly something as the same box on a Hisense RokuTV works just fine.