My experience so far
I returned and re bought the surface i5 8gb 256gb. The first one i had would do the hibernate thing every now and then, on battery usually while reading or watching something, it even did it while i was on a chat with microsoft and they were remotely controlling
it so they got to see it all happen. I returned and re bought as i was leaving on work and hoped for some stability. The other problem i ran into was after doing a USB reinstall, i installed AVG, and after that the search box on the tool bar would not open
apps, once i uninstalled AVG the search bar worked fine. Microsoft remotely controlled and did a re boot and and a system error check and after a clean install i was still getting errors that were not correctable.
The new unit i received on Tuesday (Thursday now here in AUS) so far hasn't hibernated once while using it. I haven't used it that much but a couple of half hour tv shows and some reading in the dark, things that set my last unit off. The only thing i have
done differently in setting up was not installing any other AV else than "windows defender". To be clear, in "event viewer" i still see those errors 10016, but no hibernation, soooo far. By no means do i think i wont get it as i don't think iv used it enough
to really tell, but so far so good.