Outlook 2013 client doesn't sync new mails but syncs after restarting outlook

Hi Experts,
Here are the HW & SW.
DC1, ADC Windows 2012
Exchange 2013 MBX1 & MBX2 on Win2012r2
Exchange 2013 CAS1 & CAS2 on Win2012r2
Network : EXCHANGE ON LAN and Clients using MPLS link to connect Exchange CAS (10 mbps) 100 users.
Strange issue, only for few users like 4-5 outlook, when user opens outlook gets authenticated and outlook remain cached mode. But it doesn't gets the new mails it still shows online. But the same users they get the mails on their mobile device using Active
Sync promptly without any delay and new mails shows on the OWA too. When the user restarts his outlook starts receiving new emails. 
Checked the following : 
No Application error on event logs
All users are homed on same database on same server.
No throttling policy been configured and enabled except default one.
Webmail works fine and well
Restarting outlook syncs well
No network changes
Both internal and external mails are affected for the few users who has issues
Regards, Ganesh, MCTS, MCP, ITILV2 This posting is provided with no warranties and confers no rights. Please remember to click Mark as Answer and Vote as Helpful on posts that help you. This can be beneficial to other community members reading the thread.

Hi,
Since there is no sync synchronization issue on mobile device and OWA, it is highly possible of outlook client issue.
Make sure outlook client is the latest version.
Please disable the security AVG/Firewall, especially the mail scanner module to check whether this issue persists.
Run Outlook in Safe Mode to determine if it's 3rd-party add-ins related:
Press Win + R and type “outlook.exe /safe” in the blank box, then press Enter.
Please run scanost.exe to fix the .pst file to test the result:
http://support.microsoft.com/kb/272227#appliesto
Please try to recreate profile to check this issue.
If this issue persists, please let me know.
Best Regards.

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