I am curious if the Cx series has the same issue as my B2 where Dolby Vision (Atmos?) seems to kill the video processing circuitry and requires me to power-cycle it.
Apparently the only fix is to disable it in your source, but it works like 75% of the time and I'd hate to lose the excellent picture quality of Netflix and YouTube via Google TV.
Worth trying are a different cable, and maybe a different source depending on your setup... my previous AVR had pretty consistent issues against my TV that I constantly had to soft power off and on to work around, it only happened when using the ARC port. On another setup, it turned out to be an issue with the cable.
YMMV.
Unfortunately the Google TV is direct attach, no cable.
I have CX, works without issues here. I'm watching raw .mkv and .mp4 files with DV, HDR and Atmos.