Has anybody else had any audio and video dropouts when trying to pass 4k content?

The path is AppleTV4k 32g to Yamaha RXA780 to Sony A8.

Already sent 2 back - this particular length is the only defective snap hdmi cable I’ve had. Luckily not run in unreplaceable situation

Odd - that one is passive, right?

I think Brent or Jeff B would say over 5m isn't going to happen without an active cable.

Or, it could be an apple thing too. Aren't they having resolution issues as of late.

Do you have a 4k Blu Ray player to sub and test? (because hey, what 4k installation doesn't deserve some troubleshooting time when completed :(

Brent and Jeff "did" say that.
Time marches on and products and technology improve.
We are now good to 10 meters (passive) with 4 x 6 Gbps Channel (taking you into the beginnings of 2.1).
My quick response is also the Apple TV.
#1: Update to the latest firmware 12.1.2 (I think), this removes the biggest problem that we saw which was the 4:4:4 option when selecting HDR (there is no content above 4:2:0).
#2: Dolby Vision, yest the Sony A8 is quite capable of supporting DV, but which profile is being sent? This is a problem because the 2 profile are not compatibile and displays are not accepting of both (LG is one and Sony is the other).

This post perfectly frames why I hate this industry.