Hello. I really like this router cause of its fast wi-fi speed, but it suddenly started going slow. It was going perfect without ethernet cables used. The ISP is not the problem, they were called several times and the only answer was that its running good. The download speeds are now less than 1Mbps that let's just admit, is really slow. Would really like some help fixing it. (Also tried restarting, reseting, changing the channels, even the DNS servers, and nothing helps).