Thanks for your fast answer. The power supply was a good hint. When I upgraded to version 8, I also switch from RPi 2 to RPi 3. After switching back to RPi 2 the develop fix works perfect. So I guess I need another power supply for my RPi 3.
I have the same problem. But the develop fix does not work for me. Here is my Log: iTiA Would you mind to take a look? Did I miss something? Version 7 works perfectly fine.