I'm on a works hp laptop.
Each morning, it is disconnected from the internet, and can only be restarted with a "hard restart" (press power button then a few seconds later, press power button again).
Quite a few of our laptops are having this problem.
Our IT dept reckon Windows rolled an update out a couple of weeks ago which, even after installing, sticks itself into a reinstall loop and kills the system in a variety of different ways (very sluggish performance, fan running at full chat, disconnecting internet, and more).
They say I have to leave my laptop with them, for them to effect a fix.
I don't have huge faith that they really know the root cause, and how to solve it properly; more a case of chuck a few fiddles at it, and hope one solves the symptoms. For a while, anyway.
I'll post back, if they find anything that tallies with any issues/solutions more widely reported.