Exchange Not Syncing for Some iPhone Users

Hey, everyone!
So I’m a bit stuck and wondering if anyone else has run into a similar issue. We’re running Exchange 2010 and recently 4 users have had the same issue with their iPhone where it won’t sync their mail automatically. It sync the first time they launch Mail, but
otherwise, it won’t.
I’ve experienced similar issues before, and the fix was always to remove the account from the iPhone and then readd it. That caused the first “oddity” where iOS just spun trying to remove the account. The only way we were able to get it to finally remove was
by using iOS’s “Reset All Settings.”
So once, I got that done, I went ahead, removed the Exchange account from the phone, then I even went into OWA and removed the device from that user’s profile.
Finally, I readded the account. It seemed to work for a moment, but then later in the day it stopped working again.
Now, 90% of my users are on iOS and this is only happening to 4, so it’s definitely isolated. Everyone seems to be on the same version of iOS 7.
I’ve made sure that all Exchange Services are running and the server has been up for over a month.
I’m really not sure what to tell these people. To some degree, it doesn’t seem to be a problem on our end, especially given how iOS is being weird about removing the account.
As I’m sure you know, that doesn’t make people happy.
Has anyone run into this problem before? What was the solution?
Thanks!
-Eric

Ed:
Thanks. Your first suggestion is what I did at first, though iOS wouldn't allow them to remove their accounts at first. Apple had to help them restore their phones to get it to do that. (Not sure what was going on there).
I didn't look at the IIS logs, but what I tried since I was up late on Thursday night was to reboot the server. Whatever issue was going on, that fixed it.
It's weird because all the services were running and the server acted fine, but it fixed it.
Suppose I should always take my own advice and just reboot, but taking down Exchange is always a big to-do here. People can't live without their email.
Anyway... thanks so much for the feedback. If it happens again, I'll check the IIS logs. I didn't think to try that before.
-Eric

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