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I would postulate differently. All computing devices suffer from memory leaks. All computing devices are comprised of hardware and software, which was designed and built by humans; perfection simply cannot be attained. The first release of all computing devices has always been fraught with more problems that later releases. Rebooting has always been a healthy procedure for all computing devices.
The hope was that the requirement for rebooting was lessened with BB10...but I, for one, never expected it to be eliminated.
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.