Themes are definitely the most common culprit of memory leaks. I was just recently using ITIM found here on BBOS and even though I love the look of the theme it has a MASSIVE memory leak so I had to delete it. I was also using the new berry holiday theme which also leaks but not as much as itim but made the phone, especially the keyboard lag a lot.
I was using Natemz theme Blackberry pro v4 (red) before I tried those other 2 with no problems so I went back to it. It does leak a little but very very little and nothing compared to those other 2 and very little lag. I recommend it to everyone.
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