I'm getting the same issue with drop outs, it happens sometimes once per session sometimes not at all, also I once had the pack in controller drop out completely and have to be turned back on. I have a Sony kdl-55w900a in 1080p 12bit mode(which was what the old PS4 worked perfectly in) it's only a 1080p set, it's going through a Yamaha AVR. This has never happened with the OLD PS4, PRO? More like downgrade. FIX THIS SONY!
Troubleshooting I've done, I switched from that scant crappy $1 hdmi pack-in cable back to my HDMI 1.4 Nintendo OEM cable and it still does the same thing. This is a hardware issue, hopefully Sony can fix this with firmware, if not then they'll never acknowledge it and we'll be stuck with this for the life of the Pro.