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 AC power cord of the speaker, and unplug all other items connected to the speaker. Then, plug the AC power cord in again and turn on the speaker. If the (power) indicator keeps flashing, consult your nearest Sony dealer or the shop from which you purchased this speaker.