Model :

Hardware Version :

Firmware Version :

ISP :

I have a WD-9970 using a VDSL connection and it seems to somehow drop routing from wifi to the ethernet ports. Sometimes I am unable to connect to my server if I ping their IP directly, but am able to access it via DynDNS.

My setup is as follows:
Internet --> WD9970 --> DLINK gigabit switch --> Edimax fast ethernet switch --> rest of network.
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Wifi devices IP Cams and R/Pi

The WD9970 is running following services:
VDSL
DHCP
Firewall
No-ip Dynamic DNS
Wifi

Sometimes when I am connected to the wifi, I lose the connection to my server. I can't ping it or anything. But I do have NO-IP setup, and a port forwarded to the server, and I can access the server then. It then comes back by itself.

Any idea what could be causing this?