PLWK400 loses connection to internet

Hello:
I recently purchased and installed the Linksys PLWK400 Powerline AV Wireless Network Extender kit to my home Local Access Network (LAN). To access the internet, I use a Motorola SURFboard cable modem/wi-fi router (model #SBG6580). My Internet service (ISP) through DirecTV.
The problem I am having is since I've installed the PLWK400 on my LAN, my wireless devices (laptops, smartphones, etc.) lose internet connectivity after a certain amount of time and I have to reboot (power cycle) my router to regain the connectivity. After I manually reboot my router I will regain internet connectivity for sometimes up to a day or so, but then I cannot connect to the internet again and will have to manually reboot the router again...which seems to clear the issue once again.
Sometimes, I will only have connectivity to the internet for just a few hours and will have to reboot the router again. This frequent loss of internet access did NOT happen before I installed the PLWK400 kit on my LAN. To rule out other problems, I have uninstalled the PLWK400 kit for up to a week with no internet loss issues on my connected devices. Once I reinstall the PLWK400 kit it starts happening again. It keeps happening no matter how I configure the PLE400 or PLW400 devices. I have tried to setup the PLWK400 kit using the default encryption and SSID it generates right out of the box and I've also tried assigning my own SSID and advanced encryption (where I assign an SSID and encryption type that matches my router's). Either way, my wireless devices ultimately lose connection to the internet. Again, this does NOT happen when the PLWK400 kit is NOT installed on my LAN. I believe the issue may be related to my router being on default DHCP settings and my ISP renewing it's assigned IP to my router (IP lease?) about every 24 hours or so. It seems like when this happens I lose internet connectivity while my PLWK400 is installed on the LAN. The only fiix seems to be a hard reboot of my router. Which again seems to fix the connectivity issue for about a day.
Additional information: I have made sure I am using the same assigned network key for both the PLE400 and the PLW400. Also...when I do lose internet connectivity I can still see the PLW400's SSID being broadcast when I perform a network scan. This tells me that the signal is still being sent from my wifi router through the PLE400 to the PLW400 and being emitted, but for some reason I cannot access the internet and am forced to have to reboot my router to gain internet connectivity.
Any advice or feedback you may have on what may be causing this problem would be appreciated. Or, any suggestions on how to fix it would be really appreciated. I've also tried assigning a static IP address to the PLW400 through it's online utility and also tried extending the IP lease time-frame to my devices on my router's internal settings. These actions have not worked. I still lose internet connectivity sometimes after a few hourse but mostly after about a day. I really enjoy the additional range of wi-fi in my home that the PLWK400 enables, but having to continually reboot my router to maintain connectivity to the internet is very inconvenient.

Try giving the PLW400 different SSID's so no two are the same. This will allow for more detailed troubleshooting.
Please remember to Kudo those that help you.
Linksys
Communities Technical Support

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