So i have an modem provided by my ISP. and i recently got this Archer a6 about a month ago. it was working fine until last night. it says there is no internet connection and that the wan port is unplugged but it confused me since the wan port is indeed plugged. i tried restarting the router but it did not work unfortunately. and i also tried plugging the ethernet cable directly to my PC and to my surprise it worked! so that led me to believe that the router is the problem and not the cable. what can i do to fix this? or should i try contacting support for warranty