Funny this issue is posted today... I just had a user complain this morning that he's been losing calls whenever he pulls his BB 7520 from his aftermarket case. The 7520 (Nextel), being a fat BB fits snugly in the a/m case/holster.
Basically, when a phone call comes in, BB gives you the option to "Answer" or "Ignore" the call. Since the "Ignore" option is at the bottom, it gets highlighted when the trackwheel scrolls down to it when the device is pulled out. Once the "Ignore" option is highlighted, the phone stops ringing or is silenced, however, you can still answer the call if you're able to scroll up to the "Answer" option and click on it. . . try it out . . . you might not need to give up your leather case. In case you do, let me know, and I'll gladly take them for you. . . .