Email won’t load

When I open my comcast mail message download but the body of the message is not there. It just buffers endlessly.  In order to make it work, I have to exit the mail app, wait a couple of minutes and reopen mail and the body of the messages are there. This happens on my iPad, my iPhone and my Mac. I’ve called technical support and they said the problem is on their end and that they had fixed it but the problem persist. Come on, help me please.