Outlook freezing

hello,
we use mostly outlook 2010 and little 2013 as client application. we have exchange 2013 cu3 (on -premise servers) - cas servers with mailox and transport roles..
for 2 months from time time our users are experiencing Outlook freezing problem. It mostly happens when you click send button in order to send e-mail or when you switch between e-mail and calendar.
we are getting crazy about this problem. do you have any idea.
what we have tried so far is:

1- we checked the server side logs. nothing found.
2- we change the outlook log level in order to get more detailed logs but from this logs we couldn't capture anything.

any recommendation will be highly appreciated.
thanks.
certuranAsked:
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Marshal HubsEmail ConsultantCommented:
You Outlook might be getting hanged or freeze due to any of the following reasons:

You have not installed the latest updates.
Some add-ins may be interfering with Outlook.
Size of your mailbox may be too large.
You may need to repair your Office programs.
PST/OST files or your user profile may have become corrupt.
Antivirus software may be outdated, or conflicting with Outlook.
Another running program may be conflicting with Outlook.

Try to check if any of these above issue is causing your Outlook to freeze and try to resolve that particular problem
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certuranAuthor Commented:
some how problem solved. thank you
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certuranAuthor Commented:
reason is not definite, some how problem solved.
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