核心数据管理对象属性保留

I seem to be having an issue with my managed objects not releasing memory. I have an NSOperation that downloads new information, saves it to a temp context, then merges it to the main context. All this works well but in the allocations instrument all the newly created properties stick around in memory after the merge is complete and the entire operation is deallocated. Is there any way to fix this? I've tried to reset both the temp and main contexts and refreshObject:, both don't fix this. Thanks!I seem to be having an issue with my managed ob