Anyone else have this problem? Sometimes if I slide out the keyboard, or close it, the phone shuts off. I took the back off, and noticed the battery was popped out a little bit. The battery doesn't fit very snug, so I am thinking that the vibration from sliding the keyboard can sometimes cause it to dislodge the battery. I could just just some duct tape and see if that helps...any suggestions? or is my phone defective?