I have an iPhone 4. I have it synched to my work email. Last couple of days when I press the email icon, it flashes a white screen and immediately crashes out. The phone, internet connection, etc., still appear to be working but at least one other app crashes the same way. My on off button is broken so the only way to turn it off is to let the battery die down. (The on off has been broken for over a year so I don't believe its connected). I'm not tech savvy so I have no idea what to do. Any thoughts?