Presence detection stops working

I am using network presence detection for android phones to detect @home presence of family members. Since updating to openHAB 4.1 I guess presence detection stops working every now and then.
Restarting the binding does not help. Uninstalling and installing the binding does not help. The only thing that helps is restarting openHAB.
Even with log level set to “Trace” for the binding there is no activity (sending arpings). The channel “Last seen” of a thing shows when the binding stopped working but logs don’t show any useful information.

As I use “presence detection” for locking and unlocking doors, activating and deactivating security cameras, room temperatures and so on I would like to have it as stable as it was before 4.1.

Any ideas what to do or check?

Check if any network settings changed after the update. If rolling back to a previous version restores stability, it’s likely a 4.1 issue.