I am using a router which is extended with a repeater on the upper floor. Both are operating as a mesh network using the same SSID. This is a specific option offered by the manufacturer AVM. The repeaters are integrated transparently and the clients are moving between them without disruption.
No issues at all so far, i cannot evne say by when this messages start coming in.
It’s currently on my AirSquitter, but not on my backup Raspberry.
I also checked the connection log in the router. The device itself did not switch between Router and Repeater, it is connected to the repeater all the time.
This was my first thought that it was caused by switching the connection.