I forward my xfinity emails to my iPhone. The initial tags show up with the notification on my iPhone. When I select an email, the wheel starts spinning and fails to load the email(s). If I reboot my iPhone, in most (not all) cases, the enitire emails load for viewing. Comcast advised my to switch my emails settings from POP3 to IMap but that did not solve the issue. I suspect a capacity issue or a "throttleing " down of speeds by Comcast.