WiFi Drops Every Hour

Hello - Sorry for the delay responding, I was busy trying to get more evidences about the issue. I think I finally found something interesting.

First I miss to indicate that my RBR is configured as an Access Point, connected to my ISP router via a Cat7 cable.
The RBR is acquiring its IP address from the ISP router via DHCP.
I found in the Orbi logs that there were events recorded every 6 hours showing internet connection being established  (I missed to save the exact message). I identified that the time the events were recorded were the same the RBR was renewing its IP address (my ISP provider lease time is 12 hours)
These events' time were also the same I could witness serious TV live stream freeze or pings failing against the RBR IP or the ISP router. 

Smaller freezes were also happening every hour between two DHCP lease renew requests, e.g. renew request at 1:34 implies about 3 seconds TV stream freeze, shorter freezes could be seen at 2:34, 3:34, 4:34, etc... up to the next renew request and so on.
I then concluded that the DHCP IP address renew request of the RBR was intrusive, as well as smaller events occurring hourly between each DHCP renew.
I decided to set a fixed IP address in the RBR and so far I haven't had any TV live stream freeze.
Note 1: that all traffic with buffering (music, internet radio, video) was not noticeably impacted versus Live TV which in the case of my provider is multicast
Note 2: I initially thought about Wifi drops but I'm now convinced that it is related to the RBR leaving and entering back in the network at each IP DHCP renew plus other hourly events that i cannot understand but that could be related as they are happening each hour between two renews.

Hope it helps.

I'll have a look at the new firmware if available for my region too (I'm located in France)