E1200 stops serving DHCP all of a Sudden (affects both wireless and wired)

 Greetings All,
I have a 2 year E1200 router that has given me very good service uptil now. Now, it appears to suddenly stop serving DHCP at least once daily. This results in a situation where all my devices (3 over wifi, 2 directly wired) suddenly all cannot talk over the local LAN or reach the Internet (WAN).
This issue started about a week ago when the build I live in had an issue with its network - they won't give a full explanation of what the exact issue was but somehow some media gateways were requesting MAC addresses (ARP?) from every single device in the building constantly. Since then, my E1200 gets into a funk daily, typically at night when it is idle, though I have seen it get into this condition during the day when I am actively connected to a VPN at work.
My network consists of 3-4 wireless devices, 2 wired devices connecting to the E1200 (wpa2-psk) and the E1200 is connected to a Digital-to-Analog GW that converts fiber input to 100Mb Ethernet. I have the latest firmware on it.
I realize this is very scant information to begin a hypothesis so any suggestions on whether this is a know problem and if so, how to rectify it? If it is not known, I'm all ears on how to debug it.
So far, my work around has been to reboot the E1200 and that clears up the issue but clearly that is not a good long term solution.
Thanks,
H

Hi,
If you have time, you can try to perform a hardware reset on your E1200 then reconfigure it back manually. Since you are running on the latest firmware, there's no need to reflash that. You might still have the same issue if there's really a problem from your gateway.
If everyone needs to believe in something, I believe I'll have another beer..

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