Frequent internet dropouts with two satellites relatively close to each other

Just wanted to post a quick note in case it helps anyone else: I've got an RBR50 in our cellar and two RBS50 satellites setup on the ground floor some 5-6 meters from each other, although with walls and wardrobes in between. (Why? mainly to have a single solution with Ethernet ports for the living room and home office, without the need for additional adapters, which I hoped would be a simpler and more maintainable solution.) The mesh worked very well for the first few months since I bought them two years ago, but the last year and a half the Internet connection has been dropping out more and more frequently (frustratingly so with Corona work-from-home meetings over the past year!), several times a day when at its worst. 

After a number of attempted changes (lots of firmware upgrades; switching around 2,4 GHz channels; disabling Circle; increasing WAN lease times; changing DNS servers; disabling 20/40 MHz coexistence, beamforming, MU-MIMO, fast roaming; factory reset and reinstallation) followed by waiting to see whether the connection would be stable over the next few days, I finally got around to disabling the daisy chain topology a month ago. Lo and behold, our internet connection now seems to be stable. Presumably, daisy chaining too-closely-adjacent satellites confuses them, and makes them drop everything to find the optimal route, even though both have about equally good connections to the base station.