Iphone email stops working after a short time?

I have tried to set up a co-workers email on his Iphone multiple times. I do it manual step up. It will work just fine for a while then will not work. All password, servers, ports user names are correct. He can receive and send emails. I have set up other iphones using the same technique and they continue to work just fine. Ideas?

Something is wrong with is IOS software

do itunes restoral and wipe it clean! Start over!

if email issue remains, call Apple… May need a new free iphone via warranty

You don't say what type of email connection it is. IMAP? POP? Exchange ActiveSync?

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