So far so good. Admittedly I've barely used the thing but I played some NFS and Tetris, ran the demo video in a loop.. more or less I'm trying to take it through charge cycles.
Battery was 5% last night, I turned it off, it came back on and I'm charging now.
The only thing I can see at all is it looks like they 'fixed' my power button. Initially it was below the bezel almost sunk in, it seems a little more flush and I don't have to press incredibly hard to make it work.
Why this would cause the issues I had, no idea (I would expect random power off and on maybe but not completely dead device) Here's hoping this is really fixed