I'm having the same problem! It's fine until I need to use it at night. Cox is going to get me fired from my job! I've had a technician come out multiple times to "fix" the problem. Tonight, multiple speed test show a high of 15 mbps. I'm paying for 150 mbps!!! Tried Wifi as well as ethernet cord. No other users online. New modem and router. I don't know what else to do for decent internet! It is very frustrating and I'm scared of being employed at this point. I work at home and on Beijing time. Paying over a hundred dollars a month and getting 8-15 mbps?!? That is for both upload and download speeds. It got worse since the tech came out on Friday.