Constant Password Prompting in Outlook

Hello,
I use outlook for my work email with a POP3 account through hosting.com. When I have my iPhone set to check my work account as well, and I have outlook open- I frequently (every few minutes) get an "Enter Network Password" prompt on outlook. Is there anyway to fix this? It's really annoying. I have resulted to forwarding my work email to a Yahoo! account that my iPhone is attached to- though this is a pain as I don't want to reply to my clients from a Yahoo! domain- I need to reply to them from my company's domain.
suggestions?
John

I have set Outlook to only check for email once every 15 minutes. Before it was set to check every 3. My iPhone is now also set to check once every 15 minutes. The problem no longer arises. I think it might be that the mail server was getting to many log-in queries. regardless, changing this option has eliminated the problem (at least for the last 3 hours).
cheers!

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