Fritz Box AVM device tracket issues

Hello there,
Since I’ve updated my Fritzbox to the latest 7.39 FW, I’m experiencing issues with the device tracker entities.
I’ve the last Home Assistant OS/Core/Supervisor versions installed.
Basically, I notice sporadic drop-outs of the device tracker entities that are shown as “not connected” for 10-15 seconds. After that, the entities are showed again as online and connected with the network.
This happens every 10-12 hours.
Anybody experiencing similar issues?