I have used Sonos speakers for years with no problems.  However, in recent months I find that every time I open the app on my iPhone, the sonos app is disconnected from the system so I cannot control it.  Within about 10s it reconnects fine without me having to do anything.  My wife (also using an iphone) doesn’t experience any such problems.  I’ve not knowingly changed any settings and the only app changes would be standard app updates and iOS updates.  Any help much appreciated