Why does my LUMIA 630 gets on desktop on its own?

[Windows Central Question]

while I am browsing or I am on FB or Wapp, the telephone gets often back to desktop without any reason.
That drives me mad... any reason why or how can I fix it? Thanks
Laura

 

[xandros9]

That means the app is crashing. I would first restart the phone and see if the situation improves.
And then reinstall the app.