It's odd as this new build has helped some whilst not others, plus for those who had no issues with build 10 (I count myself as one of those) it's either been the same, or as I have found it slightly less reliable, though no massively so.
I'm convinced Apple products interfere big time with Wholehome.. just connected Airport express with ethernet and it brought WH to a standstill... disconnected and its fine. Have switched on my router WiFi 5ghz again and connected my AE to that network. All working smoothly again and my WH is still rock solid after 6 days.
Really not desirable to have both your routers wireless and WH running together as they will be clashing/competing with one another.
@Jim-lad I know, and I’ve only switched it on again to see if it cures the AE problem. Ive set the router 5ghz channel to 40 so don’t clash with sky q on 36 and WH on 48.... my iPad can now see the AE and send music through it to ceiling speakers which it wasn’t doing properly before. I will monitor it but so far, everything is solid with no WH issues.