I've had this happen now twice in the last couple of months. Emails stop syncing to my X. I've closed messaging widget (force stop) and rebooted phone. Turned airplane mode on/off. Nothing. I've gotten 10-12 emails today and not one comes through. Data is on, no saver. Data push active. I'm getting Twitter updates so it seems just with emails. I actually even removed Yahoo account and re added but no results. Last time is just started working after a day or so. Any ideas?