I had the same problem after swapping from a series 1 to a series 2 6310 box.
I called Tech Dept who of course never heard of this problem
after countless hours working to solve the problem with the tech department I ended up taking videos of trying to internal log with no connection and the no prime, no connect and sending it to tech.
They had me send in the box under warranty... After next day shipping to them(so I could drive my car ASAP) it sat for over a week without being touched
after daily phone calls and 2 weeks they said "We could not find anything wrong" But
"We will change the board anyway and its a updated board"
When I finally got it back I plugged it in and like magic...wallah it worked and never stopped since
Here is one of the vids the grinding noise is a bad power door lock