Hi Stelios, thanks for using our forum, my name is Johnnatan and I am part of the Small business Support community. Did you perform a factory reset to your device? I recommend you try with this solution if this doesn´t resolve your issue, can you please reach out to our Small Business Support Center and open a Service Request to address this issue? One of our Engineers may be able to work with you and diagnose the root cause. You can find the appropriate contact information for SBSC in the below link. http://www.cisco.com/en/US/support/tsd_cisco_small_business_support_center_contacts.html

I hope you find this answer useful,

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Greetings,

Johnnatan Rodriguez Miranda.

Cisco Network Support Engineer.