I have had the Hero since October 9 and never had a problem syncing my AOL email with my Hero.
I have had it set to sync every 15 minutes and all worked well.

About a week ago I started noticing issues with not getting my messages consistently and I started seeing a message below the emails saying
"Get More Messages ____ messages total on server" (I don't recall seeing this message before). If the number of messages on the server is greater than what I have on my phone, I can manually sync and they will down load.

Sometimes my messages will sync, but not consisitently. As I type this I see that I was showing 9 messages and the server had 11 so I manually synced and two more messages downloaded to the phone but they were from over an hour ago.

I have tried deleting the account and re-setting it up but that doesn't seem to correct the issue.
(BTW, my exchange messages still sync fine)

Any ideas on what's causing this?

 

If you do get a response on the Sprint Forum, please post it here as well (or post a link to it).

Thanks

 

Nope, WiFi wasn't (isn't) on.