Direkte Antwort vom Developer (warrior1208):
1. Press the Power Button until the Reboot Menu comes up.
2. Press and hold the Reboot Button for 3-4 seconds, until you get a vibration in your hand and the phone will read out: "Are you sure you want to reboot your phone in safe mode?"
3. Click yes and that's it.
To all the people who don't know much about it: If your device keeps restarting itself, freezing, crashing, or is slow to respond, it could be caused by an app you’ve installed. You can use safe mode to start up your device with only the original software and apps that came with your phone. If the issues with your device go away in safe mode, the problem is probably caused by a third-party app downloaded on your device.