Samsung Acclaim (Android) Help!?

I've just received my Samsung Acclaim in mid July but already it acting up. My programs are running slowly and my screens freezes up, sometimes randomly, after I close a program, or if I've just ended a call. I also have been having to force close my programs. I have the Task Manager and Astro filer and I'm constantly ending the programs and deleting a lot of files, but it continues to run slow. Is this normal or does this call for a replacement?

And also, my roommate has been using my charger to charge her blackberry. Could this affect my phone/battery?
 
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