Black Screen after TV Power On / HDCP intermittent errors

I realize this is long but I feel like I am having very specific issues with my setup.

I'm having pretty consistent issues with my Roku Ultra. Now I switched my TV out from a Samsung KS8500 to a LG B4 two months ago which is when I started seeing issues. I realize that this points to a TV issue but I'm not so sure.

My setup is through an Onkyo AVR. I have PS5, PS4, Chromecast, Roku Ultra on the Onkyo. The only device that has any issues is the Roku. The AVR uses HDMI 1.4.

I have two issues that are consistently reoccurring.

First is I get a black screen when turning on the TV after a few hours. To resolve I have to unplug and plug in the HDMI from TV to AVR at the TV (most accessible connection). I use the Roku remote with HDMI CEC to power on so the AV switches to Roku automatically. I've power cycled the Roku in this state and the loading animation appears on TV and then reverts to black screen.

Second I get an HDCP error intermittently when watching. Like it'll be fine for 20 minutes - 1 hour and then randomly the error screen pops up saying I should check my HDMI cable and then after a few seconds it goes away.

I have tried different HDMI cables from AVR to TV as that is my longest run. I've tried new cables from 6ft, 20ft, 25ft which all result in same issue. I haven't tried the cable from Roku to AVR yet but that hasnt changed since I started having issues.