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It sounds like your device probably needs to either have the cache and data cleared for the built in email app, and possibly factory reset the device.
Or, you can download and install the much more reliable AOL mail app for android, and access your aol mail using the app.
If you want to go the route of repairing the built in email app. Heres how to backup your data first
And t he guide on this page will help you factory reset the device.
Then all you would need to do is add your accounts again, and import the data from your backups. Altogether, its an hour to two or three hour process.
Whereas the AOl app would only take a few minutes to download, install and setup in order to access your mail that way.
if you have further questions, let me know.
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Senior Technician and Network Switching Systems Operator / Maintainer.