Since I had this "unexpected shut down error (6008)" with version .1352 everytimes a new def update came in I reverted to version .1289 again and it was OK.
Now I tried .1356 as an over thetop update.
The error is immediately back after the first def update!

Came back to .1289 and observing the system now. After the next update this evening I will report back!
Edit: First big def update of .1289 to current status folowed by a reboot did
not show the 6008 error in the event viewer.