how do i get back to main phone screen after taking a picture with lumino 640 XL phone

[WPCentral Question]

after taking a picture I cantget back to the main screen on my phone.With my nokia lumina 920 alll I did was push the back arrow and it went back,with the 640 XL I have to turn the phone all the way off,sometimes that works

 

[Teo Bartulovic]

Something, somewhere went terribly wrong, you should perform hard reset as soon as possible

 

[Richard Culverhouse]

Does it freeze, or can you and hold the start button until you get the apps showing? If so, just click the x on the camera app to close it.