I'll post this in case it's helpful, although it is unique to my system: I run HAOS on a NUC. I have an 2-unit ASUS ZenWifi AX setup as a mesh with a wired 1G backhaul. My 2.4G wifi has a different SSID from my 5G wifi. I had troubles with my HA Voice PE randomly disconnecting then not reconnecting. So I gave it a dedicated IP, even that didn't solve the problem. It turned out that my ASUS router has a feature called "Smart Connect" and what they claim it does is hand-off wifi connected items to either 2.4G band or 5G band based on some predetermined criteria to increase performance. What I found was happening was that my HA Voice PE was configured with the 2.4G SSID and a dedicated IP, but the router would hand it off to the 5G radio ...the HA Voice PE can't use 5G and it didn't have the SSID for 5G, so it would try to reconnect and then fail. Bottom line: switching this feature "off" solved my problem.