Help Keep getting failed to sign in to email error


My email was working fine until a couple days ago. I think it may be related to the newest update, but not positive.

About every 30 minutes my phone vibrates and says it failed to sign in to my (AOL) email. Some of the time it works and gets my new emails. No settings have been changed (other than downloading a new system update) on my email, and it used to work perfectly.

Any ideas??