I have this problem with my PS4. Sometimes i get it up and running via safemode, and after restarting the device all works fine. I can play games etc. The problem starts if you decide to tilt or pick the device up. This is even if the tilt is just like 10°. After that we are in a loop of BLOD. And after some time of wiggling the device may start up again.
Have any ideas?
I even managed to capture a video of this problem, you can see it at