Any button on the speaker cannot be operated
The speaker may be in the protect mode if the (power) indicator is flashing red, none of the buttons can be operated, and the speaker cannot be turned off by the (power)/ PAIRING button.
Unplug the power plug, and disconnect all other items connected to the speaker. Then, plug the power plug again and turn on the speaker again. If the (power) indicator keeps flashing, consult your nearest Sony dealer or the shop from which you purchased this speaker.