Since I reinstalled the Sonos app, it takes 40 seconds to launch every time. That is ridiculous and makes the system useless.

How will you solve this? I see same topics here of years ago of people who have the same issue. I invested a lot in Sonos products but this way I dont want to use it any longer. 

My network, router etc are all fine. It all worked fine untill I installed your new version. Same happened to other people I know who use Sonos.