Hi @Filip_Smrekar_Apih, there are a couple of things you could try to determine if this is a hardware fault or possibly just a settings glitch.
- reset the speaker by press/hold the power button for around 8sec
- update the firmware for the speaker to the latest revision
If both of the above fail to resolve its possible there might be a lose connection inside which is causing power on fault, at which point I would suggest you reach out to firstname.lastname@example.org for assistance under your warranty. Include your troubleshooting steps taken, serial and place of purchase to speed things up.