Presence is not stable with Ubiquity Unifi Network, any alternatives available?

Hi Peter!
Why are you using static IP with the unifi app? For me there is need for static IP and MAC detection works stable.
There’s a german written hint on the iOS feature of “private IP” Unifi Flow Wifi? - #8 by RonnyW

If there’s more than one access point, you need to fix the roaming between them:
I created an advanced flow with “timer” to double-check connection before marking away.

Hope this helps