Hi Jaka,
Thank you for helping. I am running separate power supplies for the RPi and OAK. The RPi is running with it's original PS. I start to think the camera is defective. I can feel it is getting warmer quite quickly and then it is crashing in 15/20 seconds.
The rgb_preview is working, but I need the object detection function (that's why I bought the OAK).
I wonder if you have any further advice?
I have two threads running on this issue, one for RPi image you provided and one for using the installation instructions.