RAX40 Wifi Connection Issues with Multiple Devices from Various Manufacturers

I have had issues of my wifi dropping since I bought this last year. I kept having Comcast come over and try to fix it because I thought it being new wouldn't have been the issue now I'm seeing people have the same problem as myself. Has anyone had luck on a fix? And isn't it insane that you only have 90 days of customer support? You pay more money for a better product and you can't get decent customer service... What the hell.