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I was using my Xperia Z3 compact fine but one day it just went crazy. The camera keeps popping up. Even when I do nothing or I'm in the middle of some other apps. I don't know why it happens. Does anyone have an idea and know how to fix it? Thank you very much! 
Hi Annthias,
Welcome to the community,
Try clearing out the Camera application first.
Menu > Apps > All > Camera > Clear Cache > Clear Data
Let us know if the issue continues.
If the above does not help,try booting in safe mode:
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Good,keep us updated. Hopefully you'll have it back in no time.
This is happening to me with my xperia z3 compact D5803 running android 5.1.1. I recently dropped my phone outside getting out of my car, and ever since the camera keeps popping up. This happens when I'm using my phone, checking my email, using the chrome browser, and even when it's sitting on the table undisturbed. So for now, I've "disabled" the camera in the app menu and it seems to stop the issue. But now I don't have the native camera app. So, I downloaded Camera FV-5 Lite just so I had the ability to take photos. Interestingly, whenever I open that app, it immediately starts taking photos as if I'm holding down the side camera button on the phone. Once I actually tap on the screen to "take" a photo, the FV-5 camera app stops taking photos and everything settles down. What can be done to get my phone working normally again? Thanks.
well my xperia C3 is experiencing the same problem yet nth happen to my phone before...it was so annoying till i disable my camera app for nw....