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Very disappointed.  Connection to PANDORA constantly dropping.  Using TuneIn radio is impossible.  All happening free last weeks update.  
 

any suggestions… or perhaps acknowledgement that the app is broken would be appreciated.

First off, the app is just a controller.  All the connections and streaming are done by the firmware in the Sonos hardware.  Second, if something was broken with the app or firmware, there would be a hundred page thread about it, rather than the few complaints we see after every update.

Instead, your symptoms are classic indications of duplicate IP addresses. These often show up after an update or power outage because a reboot requires the device to request a new IP, and the router, having lost track of current IP assignments, issues a new IP that is in use by another device.  To cure this, do the following:

Reboot/power cycle your devices in the following order:

Modem
Router
Switches or hubs
Wired Sonos units
Wireless Sonos units
Computers/printers
Wireless devices - phones/tablets etc.

Allow each device to come back up before proceeding to the next.  Note you can prevent this from happening again by reserving IP addresses for your Sonos devices in your router setup.  See your router manual for instructions.