This sounds very much like a software error on the phone. If you haven't already done so, manually reboot the phone by turning it completely off and then back on again. If the same difficulty persists, make sure that other devices are not trying to connect to the speaker by Bluetooth while pairing is in progress. This might mean disabling bluetooth on all other paired devices temporarily while making this connection. If the S7 has been paired previously, try removing the old entry entirely from the Bluetooth list on the phone before placing the speaker into pairing mode. Hope this helps!