Sounds like a hardware issue. Cannot reproduce. Are you running the mainline release or did you opt in to the experimental builds?
Updates would crap out with random errors like 80074005 - which a casual user should never see. I got it working again by stopping the update services from the console (net stop ...), deleting the cache and re-running.
The store would be running, then you'd Alt-Tab out and back again and it would be gone. Same happened with other Universal apps, OneNote in particular.
It certainly got more reliable over time, and I have tried the insider builds on a spare laptop and they're better - but the initial 10240 release was sub-par.
That literally means nothing. You can have CPUs which run Prime95 for days without fail and then die after running a proper memtest.