Noticed since I work in a rather quiet environment. During office hours I need to keep it on vibrate mode. When the phone vibrates during a call, it causes a severe rattling noise when the phone is in my hands or if the bottom is not resting against a hard object. Removing the battery compartment cover and repeat, and the rattle is non existant. With the battery cover on, the rattle can be diminished by pressing firmly on the top section of the cover. Anyone else noticing this issue?