Hi BeachKat!
What is the file free on your BB? Go to options-status and look at the 3rd line down. Try to keep this number above 15Mb.
If the number is getting low there are several things you can do: Memory Management
Also, with your browser running, go to menu-options-cache operations and clear your cache on a periodic basis dependent on how much browsing you tend to do.
You can also pull the battery out with the device ON. Wait about a minute and put the battery back in. Let the BB completely restart and see if that doesn't help. Clears out the memory and refreshes the BB; like rebooting your pc.
When you have anomalous behavior or sluggish response in your BB a battery pull often helps to clear it up.
I hope that helps. Let us know how it goes. 
