Windows 10: Mysterious notifications (or something) lately

About 2 weeks I noticed something really annoying - but only when using an app in fullscreen mode (ie games, Netflix, etc). Every few minutes Windows would automatically switch to the desktop. As you can imagine, this is SUPER annoying when playing a game. I could not figure what app was causing it.

I haven't been using fullscreen app as much the past couple of weeks but I'd notice it when typing in the browser - the focus would switch briefly to the Windows Start button and thus my typing would stop. I'd have to click back into the page to continue typing.

After the last Windows update (earlier this week, I'm on the fast insider ring), this seems to have resolved itself but now when I hit alt-tab to switch between apps, there's a blank 'NotificationsForm' option. Selecting it from alt-tab doesn't seem to do anything except take focus away from whatever app I'm using.

Anyone else experience this?

:)

 

Sky Force Notifications after ANNA update! whats that?

that notification application looks mysterious and yes it is not related to notifications widget on homescreen!

 

Phantom Window?

Update 5/27/2017:

So I was able to download the most recent update (KB4020102) and it seems to have solved the issue.

The mystery window may have had something to do with the failed cumulative update, as it would explain why it occurred exactly once every hour. After I manually downloaded the update package from the
Windows Update Catalog, the normal system window saying that I had to restart for an update popped up at the exact time the mystery window would have.

Maybe the mystery window was the system notification failing?

In any case, the issue is no longer.