Inbuilt apps crash

[unplanned bacon]

Settings
Calendar
Phone Companion

And I think possibly others randomly force quit for no apparent reason

 

[Slashgeek]

Open up an elevated PowerShell prompt by typing "PowerShell" in start, right-clicking on the first option, and selecting "Run as administrator." Inside the prompt, paste the following:

Get-AppXPackage | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

Let it run for some time.