Email issues again

Since yesterday, I keep getting timeouts on various accounts when I attempt to retrieve email.   My settings don't seem to be the issue, as they often work just fine.

I will also occasionally get a dialog pop-up asking me to enter my ID and password, which seems to yield results about half the time.

There is no consistency on which of my accounts this occurs on.  This *does* seem to be occurring more consistently during the day, however - which suggests to me it may be a server capacity issue.

Then, when the issue clears up, I find that I receive emails that have been delayed for hours.  

The more I think about it, this has been an intermittent problem for YEARS with Cox email; it's just gotten more pronounced in recent months.  

I am quite perturbed that this doesn't seem to have been addressed or even explained.   Unacceptable.

Between this and ongoing cable service issues, I'm seriously considering leaving when my contract is up.