I can only turn the device on when I plugged in the power supply.
It only can be turn on by pressing the on button multiple times or when the power supply is plugged in. I have also tried resetting it by pressing play/pause button and + button, but the problem is still there. I bought this unit at Germany and brought it back to Malaysia to use. Then, Malaysia jbl service center doesn't accept my unit even though it is still under warranty. Btw this unit is jbl xtreme 2.
Update: I manage to solve the problem by updating the software of the unit.
I solve it by updating the unit software.