KB02843What is the Low Memory Manager feature on the BlackBerry smartphone
KB14320How to maximize free space and battery power on the BlackBerry smartphone
KB14213Call logs, SMS text messages, and email messages are deleted from the BlackBerry smartphone
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.