Exchange 2013 Login promtp

From time to time I would say every several weeks Exchange will prompt users to login?

I have two CAS one one CU3 one not

Two MBX Tranport Servers both on CU3

I plan to update the CAS not CU3 after April 15th as we are in busy season.

Any idea what could be causing this, MS tech is clue less and they find nothing in logs etc.

I end up rebooting both CAS and the issue goes away for several weeks but it hit again today.

just wanted to know if anyone had any idea what could be causing this??
jgutierr76Asked:
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santhoshuConnect With a Mentor Commented:
Looks like this is a known issue...
I have copied the below post from this blog.  If that doesn't resolve, then go thru' the entire post

http://social.technet.microsoft.com/Forums/en-US/11370f4d-b931-4338-8ab7-acc9e1a231e0/outlook-2013-asks-for-credentials-connecting-to-exchange-2010-multiple-times?forum=officeitpro

(I know the post is for Exchange 2010, but I assume it will work with Exchange 2013 as well)

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This resolved the very same issue for me, that a number of users from different companys have came forward with, hope it can help someone.

Close outlook

Go to

HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Profiles -
 rename Profiles to Profilesold

then restart Outlook and make a new profile.
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jgutierr76Author Commented:
Just reading that post shed a lot of light I have tried several things on that list with no progress.  Thank you for posting it I will keep an eye on that blog posts.
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