Since installing my Sonos system in 2017 it has been rock solid but since the last 9.2 controller update my Android devices starts to miss various rooms:-(. I've got a variety of speakers One, Play:3, Play:5 and a Connect. The Sonos Controllers are installed on Samsung Galaxy Tab S2 & S3 plus S7 & S8 phones. Which speakers are missing seems to be random, note I can ping/see all of the speakers on the LAN. Switching them off and on again does not fix the problem either:-(. My PC Windows 10 controller works fine on all PCs! Any suggestions?