I'm having an issue with email sync. In the email app, one of my email accounts will sync for a few days then just stop syncing. I don't notice it until it dawns on me that I haven't gotten new email in a while. It won't let me manually sync either. At the top, the last sync date will remain static showing a few days ago. I've deleted the account and then set it up again twice and that works for a few days, then it fails again. This is an old verizon.net account that I've never had issues with on any other device. Any thoughts?