Orbi RBR50 dropping internet connection constantly

Yes I found a solution! Since I changed my configuration as outlined in my previous post all is running stable, no more internet drops. The flaw was in the setup of the Orbi as router and the ISP modem in bridge mode, which according to best practice should be the proper set-up. In my case however, or I should better say in the case of UPC Unity Media being the ISP provider and the modem being a UPC connect box, the bridge mode does not really work as it should. Unitymedia switched some time ago to IPv6 and when set to bridge mode, it kind of tunnels IPv6 to IP4, which seems not work with the Orbi. The remedy was, to operate the UPC connect box in router mode, but to turn off Wirelss and DHCP and to set-up a DMZ. The Orbi still operates in router mode as does the Connect box. The Orbi is setup with a manually set IP address of the DMZ zone and the IP address of the UPC connect box as gateway. In this configuration, it works flawless since almost a week now. Problem solved! I should mention here, that for me it was important to keep the Orbi in router mode, as I need the features such as scheduled operation and parental control. If someone does not need these features, there is a simpler solution, such as to run Orbi in AP mode and to use the ISP modem in router mode.