The reply from iPort is:
We have become aware that Sonos just did an update on their platform which has caused some xPRESS keypads to no longer control the devices they were bound to. In order to resolve this concern, please do the following:
1. Fully charge your xPRESS keypad until the LED indictor turns green.
2. Conduct a firmware update on the xPRESS keypads by simultaneously holding down the Play/Pause and Volume UP keys for 12 seconds until the LED begin to flash purple.
3. Wait until the firmware update is complete as indicated by a flashing while LED, then test the keypad for Sonos control.