Please provide the exact steps you conduct, starting from your BB Homescreen (for on-device commands, of course), that results in this prompt. Also, please provide the exact and complete content of the prompt...that as well can help us narrow down what is happening in your situation.
Thanks and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.