mac os, iOS and remote all lose ability to control system on a daily basis. System had been trouble free for months; this defect seems systemic and related to updates. App seems to connect to internet radio, but shows play button. Hitting play toggles state, no music plays. Remote does not show globe icon. Rebooting router and Soundtouch clears problem. Problem recurrs a few hours later.
[edited - can't delete] Problem seems to be with Google WiFi router, not SoundTouch. Google WiFi support gave me advice which seems to have fixed it.