I've had the same problem few days ago,
Fixed by going to safe mode, then uninstalled the Clock app (3rd party), and couple of others too.
But my problem now, is that I can't start "ANY" weather app (3rd party or Microsoft's one), it just stuck at the load screen,
Mail app can't send or receive any emails and it crashes if I selected "Sync",
Calendar app is not showing any live actions, and sometimes in Desktop view, If I am in a window, and that window is selected, it automatically deselect the window "as if I pressed on another window" and select it back again, it happens within a second.
My PC is updated to the latest.
Ran the troubleshoot thing and it says display adapter is out of date, but it's not true.
I hope Microsoft sort this out soon, cause I don't want to regret my purchase.
Thanks in advance.