HomeKit accessories "No Response" status

I have Home installation which includes a variety of home automation accessories, including accessories that are not HomeKit certified. It is regularly plagued by accessories in "No Response" mode. Usually this is only a brief state - it may last a few minutes, or perhaps an hour or so, and then clear., but occasionally it becomes so persistent that it is necessary to delete the accesor and re-install it into Hme. Recently, after a period of stability I had 7 non-certified accessories simultaneously go into a persistent (4 days) "No Response" mode. Interrupting my home's power supply (which forces all equipment to reboot) did not help on this occasion,

I have an Apple TV 4K and a HomePod Mini on my network. From something I read on an internet forum, I ran an experiment. I disconnected the HomePod Mini, and then interrupted my home's power supply. After allowing time for everything to reboot and settle down, I found that the 7 recalcitrant accessories were all properly online and responding.

The apparent implication of this is that either the HomePod Mini, or the HomePod Mini working in conjunction with the Apple TV, prevents the Home system from working correctly. Is Apple aware of this, and is there any by-pass (apart from keeping the HomePod Mini disconnected)?