I'm continually getting errors when I receive my email from my windstream.net account.

Sometimes my email comes in, and sometimes it doesn't. I don't understand what the problem is! I've tried resetting the email account, I've followed countless directions that I've seen with other posts, and I just can't seem to find the problem. I get different error numbers everytime the error occurs. Sometimes it is error #150, or #3170, and sometimes it has no number at all. I'm getting sick of hearing that little horn beep when the error occurs. It's driving me crazy! Sometimes it will tell me that Outlook cannot verify the server information, and sometimes it will say it just can't FIND the mail. UGH! 

Can someone please offer me ANY useful information!?! PLEASE!?