App's running at unlock

[Bfbittar1]

Sometimes i unlock my device and it opens an app like calculator, weather prediction or sone other. 

Why it happens and how can i fix it?! I consider trying a factory reset but i'm waiting the update! 

Can someone came upnwith something?! 

Thanks

[Amcs]

HI. Are you using a launcher other than the Xperia std? I find when I unlock the screen the last app opened opens up. With Xperia launcher it never happens. This only started after upgrading to Android 7.