This is a big issue with QIK; which was posted in an earlier post. If you are using a different app that does this, please post the name of that app. The issue is the app starts the camera and uses all of the memory for the camera; however it does not release the memory for additional useage. So it causes the camerta to crash. For now the only fix is resettings the phone. The issue is with the app and can only be fixed by the developer

Here is the link to my original post:
http://androidforums.com/motorola-backflip/59435-fyi-issues-qik-backflip.html