From your profile, it looks like you would be better off using the S1 app with the speakers you have listed.
If this is not the case, can you list the speakers you currently own?
It is now possible to downgrade to the S1 app from the S2 app, which would make your system more stable if you are still using the speakers on your profile.
Otherwise, can you try uninstalling the app, then reinstalling it? This should allow you to reconnect to your system.
Aside from that, if you do not have any of the older speakers hardwired to your router, you should consider doing that to see if it solves your issue.