My daughter and I both have BlackBerry Curves that are approxiamately 2 years old. They are constantly shutting down during phone calls and web browsing even though the battery shows a full charge. When they finally finish rebooting the battery indicators show that they are completely drained and need to be recharged. The screens freeze regularly and the little clock icon keeps spinning whenever we try to do the most basic functions. I can't wait to upgrade to different phone but can't afford to buy four of them at once. What can we do to get by until we upgrade?