As of yesterday, if I put my Dell XPS 13 9350 (Windows 10) to sleep and wake it up again, it boots up from scratch, applications complain that they were forced to quit with unsaved files, etc.
It seems this specifically occurs if it is on battery power when I wake it up. (Incidentally I'm fairly sure it occurs whether I put it to sleep by closing the lid, using the power button, or using the Start menu. It also occurs if I hibernates instead of sleep, though I never do this so have only tested it once.)
I assume this is due to some update Dell Update made a couple of days ago, but I don't know what it was.
I've since updated drivers from the Dell site & elsewhere, uninstalled video drivers (which fixed this problem for someone else on this site), and specifically checked that the battery-related drivers are up to date, but none of this helped.
Solved! Go to Solution.
(Incidentally I've also tried manually updating the Intel Management Engine Driver to the latest version, because this was causing some people similar problems a year ago; however this didn't help. The advice last year was to install an old version (9.5) but apparently this can't be done on the XPS 13 as that version is not compatible.)
OK, so I finally seem to have fixed it myself (thanks to a post on Reddit).
This removes the Sleep option from Start menu>Power (and elsewhere), but fixes the problem. From the behaviour, it now seems to be hibernating rather than sleeping when I close the lid or press the power button, in that it takes longer to 'sleep' and wake up. Whatever, it works.