Clicking during Recording: I believe this is a software issue. Even if it is a hardware issue, Apple most likely will not fix it by physical means. They simply can fix it using software updates which could turn off wifi once the camera app is opened, and turn it back on when it is exited. This affects nearly all if not all ipod touch 4g's. Light Leak: This has been happening since the 2g ipod touch. It is even less an issue on the 4g since the screen is now glued to glass. Heating up: All electronics generates heat. This heat is normal. The only real issue people should worry about is if there screen moves and can be pushed in and out.