The first place I would check is free memory or File Free size of your Blackberry. It happened to me after I updated OS my 8320. It showed less than 3MB after a battery pull.

After some google searches, here is an article of how to maximize free memory on your Blackberry. I removed unwanted .cod, extra theme, voice activated dialing, 83xx media and etc.

To show Blackberry Help Me screen, go to advanced options, then applictions, and press Alt, Cap and H key all together. This is the Help Me screen after wipe and flash the OS:

After enterprise activation, and load the applications I use daily: Google Gmail, Goolge GTalk, Viigo, Mobipocket Reader. And load 2 company testing product. The File Free shows:

I fee much better seeing it’s over 20MB now This amount of free memory will make 8320 work better with the upcoming highly expected 4.5 OS.