Hi there!
"Hacking" of a BB would be highly unusual and unexpected -- if ever. After all, POTUS has one, and such would not be allowed if they were hackable. I believe that something else is going on, but lacking specifics, only generic advice can be given.
Anytime random strange behavior or sluggishness creeps in, the first thing to do is a battery pop reboot. With power ON, remove the back cover and pull out the battery. Wait about a minute then replace the battery and cover. Power up and wait patiently through the long reboot -- ~5 minutes. See if things have returned to good operation. Like all computing devices, BB's suffer from memory leaks and such...with a hard reboot being the best cure.
If that does not work, then please return to these forums (http://supportforums.blackberry.com/rim/) and register an account so that we can provide you with direct assistance.
Best!
Occam's Razor nearly always applies when troubleshooting technology issues!
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