Hello,
I am getting this behavior on most of my Mik's RB450g various version of ROS to current,
All Ubiquiti M2 AP M5 back hauls I think mostly the one with lots of AP's and back hauls.
I am monitoring AP for device to be on 2 AP. or flipping back an forth.

154 A 0C:3E:9F:D8:BA:04 10.0.2.88 10.0.2.91 hotspot1 1h
153 D 0C:3E:9F:D8:BA:04 169.254.242.15 10.0.2.89 hotspot1 12h

143 D 28:E1:4C:F3:A2:D8 192.168.0.13 10.0.2.57 hotspot1 12h
216 H 28:E1:4C:F3:A2:D8 10.0.2.58 10.0.2.58 hotspot1 12h

67 D 88:CB:87:A5:DF:C4 10.0.1.73 10.0.1.73 hotspot1 12h
184 H 88:CB:87:A5:DF:C4 10.0.1.32 10.0.1.32 hotspot1 12h

Any ideas
Bill