Eris E3.5BT and Eris E4.5BT speakers will store two paired devices in memory at a time, this is so devices that were previously paired can reconnect when prompted to do so by their users. However some mobile devices like iOS phones or iPads always scan for Bluetooth connection when Bluetooth is turned on and running in the background. Any device that has an automatic BT connection searcher on mobile or computer devices may try to automatically connect to the Eris BT speakers because it had been previously paired, but are now not directed by the it's owner. When this occurs, you may hear a drop out in the audio as a result. This attempt to complete the automatic pairing process will stop after about 30 seconds if left unattended.
Please note, that this is a by product of Bluetooth itself, not the Eris BT design, Bluetooth does not allow more than one device to be paired and streaming at the same time, thus this anomaly will occur each time another previously attached BT device comes into the radius of the Eris BT speaker.