New - RBR850 / RBS850 Firmware Version v4.6.7.13 Official Release

Zweiklang If your Orbi satellite ring is solid magenta, it is unable to obtain an IP address from your router or unable to your router. If it's pulsing magenta, it's still attempting to connect but just lost it's signal. If the router is doing that, the WAN port link is down, the router is unable to get the IP address from the modem or ISP, or the router is unable to connect to the Internet. 

Does that always happen at the same time each day? You should double check there's no scheduled blocking going on

There was news about a father that had purchased a wifi blocker and set it up in his house to block the wifi at certain times during the night to prevent his kids from using the Internet as they were addicted to it. Get off around dinner time and again at bed time! It would just kill off the wifi signal. Problem was it's range, it also took out the neighbours and they were clueless contacting the IPS about why they are limiting their Internet for quite some time before they managed to figure that one out!

However, in your case the router is doing it as well right? Check with the ISP end and your Fritz!Box. Either could have a parental control scheduled to block Internet access if the time is always the same and on the dot when it happens. Then the Orbi lights would be just a side-effect reaction from that occuring

EDIT: Oh just read your next post about the smart plugs, yep that could do it as well!