X3000 Router - Unable to contact DHCP Server

I have been experiencing this problem for about a week or two...
Every couple of hours all of my computers and devices on the network lose their network connectivity and no matter what you do on the pc, nothing works...
But as soon as you restart the router... everything works fine again...
I have reset the router configuration, re-loaded the firmware and even changed the dhcp settings and the problem persists...
Anyone have a solution?

I would like to ask few questions, before I suggest you for any troubleshooting steps. Like- does it happen in both wired and wireless network? You can try the following combination of settings:-
A] With the help of Cisco Connect Software (if at all you have installed the router with the help of this software)
          1] Open the software and go to the option which says "Router Settings"
          2] Then click on the option which says "Advanced Settings" which will take you to the router's configuration page.
         3] Then go to the Wireless tab, keep network mode as mixed, and make Channel Width to 20 MHz only and Channel to 6, 9, 11..
         4] Lower the MTU (Maximum Transmission Unit) from 1500 to 1400 or less (usually found on your router's main/ basic setup page)
B] If you haven't installed Cisco Connect then you can log on to the router's user interface using its default IP address in the browser which is 192.168.1.1 and type in 'admin' as the password leaving the user name field blank. This will take you to the router's web interface and then follow steps as mentioned above to make the changes.
Then check the connectivity status…

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