We have a Static IP provided by our ISP. When we set the router to Static IP and enter the Static IP address and correct gateway and DNS the router gives us access to the internet for about 5 minutes and then looses it. It will only stay connected if used in DHCP mode. What are we doing wrong or what do we need to check. Our old Lysis router works fine when set on static so I am 100% sure our ISP modem is fine. Any help would be greatly appreciated.