Got the Marshmallow update this morning, phones been good for about 14 hours and now all of a sudden while updating apps the phone re-started and has been re-starting ever since. It goes through boot-up screens to the "hand stitched" screen and then shows me a small message indicating it is optimizing 1 of 27 apps like it is doing an upgrade, it will sit on that for a few seconds and then the screen just goes black. After a couple minutes the process starts over again all by itself. It has been sitting here on my desk doing this for about 45 minutes now. Looks like I was able to experience Marshmallow for about a day, going to have to head back to the Nexus 6 (with no Marshmallow yet) and get a hold of Moto.