It's because of the stupid app!
My solution is: connect to the app to setup everything: EQ, Placement, etc.... Then remove the speaker from the app and delete the app! If you use bluetooth input, delete the speaker from your phone bluetooth setting and pair it again as a normal bluetooth speaker. Then unplug the power cable and replug, enjoy and forget about the app. It doesn't really matter if you turn on the auto-power or not as long as you don't use the stupit app! The absolutely worked for me.