My two Nest Minis will work well as two separate speakers but problems arise when I try to cast music to them as a group or a stereo pair. When I create a strreo pair I can cast audio from within apps like YT music or Spotify for a couple of minutes, then the option disappear. Sometimes it appears again after a reboot. It works better from Windows or ios devices, but almost never from Android devices, which is kind of strange. I can often cast my phone audio from within the Google Home app though but I want to be able to cast from my audio apps on Android without rebooting every time. Also, a family members new Android device can't cast Audio to the stereo pair even after a reboot, but casting to a single speaker works, and it works with Bluetooth or mirroring in the Home app. I have had this issue for over a year now. Tried everything. Reseting, renaming, even bought two additional Nest Minis. Exactly the same issue. Could it be a problem with my router (Asus rt-n12e) that affects how you stream to multiple Nest Minis from within apps on Android?