Why is my Lumia 929 phone opening and closing apps, settings, and everything else on its own?

[Windows Central Question]

My phone is opening and closing things without being prompted. While trying to put items in my calendar it was opening other dates choose its own times, and when I returned to the main screed it would open cortana, then my pictures, then the weather. When I went to settings to search it was opening everything so I couldn't even get to updates. At this point my phone is useless because it won't let me text or answer a call without going haywire.

 

[ven07]

Try a soft reset.. check if it solves it > if not; move to hard reset (button combo) and check >if not; download the Windows Device Recovery Tool and reset the phone using that

Soft Reset

The soft reset is the same thing as pulling your battery (on devices where that is possible). This method will not remove anything at all from your phone and is completely safe to attempt in any problem situation.
You perform the soft reset by having your phone turned on. Then press and hold the volume down + power buttons until your phone vibrates and restarts. Note that you should not touch the device screen during the process (not even when the 'slide down to power off' prompt appears).

Hard Reset

The hard reset will bring your phone back to factory settings, the same state as when the device was first turned on. All apps, messages, media, personal settings, etc will be removed from the phone. If backup is turned on under Settings, you can restore your apps and settings after performing a hard reset (as long as you initialize the phone with the same Microsoft Account). Note that resetting your device will not remove any OS or firmware updates. You will remain on the same version of Windows Phone after the reset.
If you can TURN ON your device you can reset your phone under Settings: Settings > about > reset your phone

If you can't open your device because of a forgotten PIN (or similar), you can use the button method: Press and hold the power-, volume-down- and camera buttons until the phone vibrates. Then release the power-button and keep the other two buttons pressed for another five seconds. The phone should reset to factory settings.

WDRT: http://www.microsoft.com/en-us/mobile/support/faq/?action=singleTopic&topic=FA142987

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