iOS crashing between scenes, memory problem?

Hi again

I'm finally at the end of the development cycle and now, after putting everything together, i get crashes between scenes, for instance, i load level 1, go back to menu and load level 1 again and the app crashes on iPad 1

I'm assuming it's a memory problem but i'm not sure how to check this out, xcode unload very few objects (like 9 or so) but it's says i'm only using 2mb of system memory so i'm not sure how do i really check if it's a memory problem

the levels actually load quite a lot of stuff, and i have a lot of singletons being referenced throughout the game, but i want to be sure i'm having a memory problem before trying to fix it