The speaker does not turn on, or automatically turns off

Check the following:

• Depending on the specifications of the USB AC adaptor, when you use a speaker with a high volume, the remaining battery may decrease, or the speaker may turn off even though the adaptor is connected to the AC outlet. This is not a malfunction. If this occurs, turn off the speaker, wait until the speaker is fully charged, and then use it again.
• For environmental considerations, the speaker system will automatically enter standby mode twenty minutes after the playback stops. To avoid this, use the Sony | Home Entertainment Connect or Sony | BRAVIA Connect app to turn off the Auto Standby setting.