Just updating with my experience after posting my initial problems
above.I used the online Google Nest Support to submit my issue, they
agreed it was a fault and sent a replacement unit under RMA. No surprise
the replacement unit had the identical so...
Also getting this issue of sound delay alongside occasional frame skips.
The delay time is really variable between pauses and restarts, up to
easily a half second. I can press the home button, the whole home screen
loads and then a metronome can stil...