I was worried about this too when I first got mine. My issue was facebook, I know that is not your issue. I got quickpull (awesome) and since then I have to use it very rarely. I run about 30k or so with 4-5 apps installed. I just had to do a pull, my freakin red light would not stop blinking so I did it. Look into that program while you are trying to narrow down which app - if any is causing it.
I just wanted to jump in and ask a quick question regarding this. I'm with TMO and I have FaceBook but I don't use it. I don't even have a FaceBook. Ha! However, I believe that FB is pushed through with TMO so there's no way to get rid of it correct? Is it still going to be a memory killer for me? I don't really have memory issues but I'm curious. Thanks guys!
QuickPull- free app right here on Crackberry- You can set it to reset your phone (same as battery pull) at some obscene hour while your sleeping. Has worked wonders for me! I set it for 4am so i havent had to do battery pulls at all- cleans up memory as well!