Sync failure after most recent update

On May 2nd, I woke up and my email would not send/receive to my phone.  I was traveling.  Spent the whole WEEK trying to remedy this and do all the things recommended (deleting account, IMAP, reset password).  Nothing worked.  Then suddenly, on Friday, May 8th, email started working on my iPhone again.  DIdn't do anything different, it just started again.

NOW, the iPhone DOES NOT SYNC with my computer at all.  I can't see any of the file folders on the iPhone, messages read on the iPhone are still showing on the computer, etc.

What is the solution?  Why is it always so difficult to connect to Xfinity and Comcast?