Our house was built in 1980. When high speed internet became available we were persuaded to pay for the faster speed but after months of inability to get those faster speeds (yet being charged for them) we were told that a simple test performed remotely by Cox showed that our wiring from 1980 did not support speeds that fast. I was advised I needed a Docsis 3.0 modem and rather than rent I purchased a Motorola SURFboard SB6141 modem which the Cox representative assured me was fine. I also cut back to a slower internet speed supposedly compatible with our wiring. Then another household member went to the Cox Store to exchange an old cable box that wasn't working and was persuaded that we had to increase our internet speed to go along with the new Contour box. I did not insist that we not pay for what our wiring could not support and we have paid for the faster speed which we do not get. We currently average between 220-280 Mbs download and about 31.6 upload. I cannot afford to rewire the house based on one person's claim that that is the problem. Most of the time, when we receive internet service, we are able to do what we need with our current speed internet service. If I had some confidence that replacing my Docsis 3.0 with a 3.1 modem would keep my internet from failing every couple of weeks I might do that but I do NOT think my modem is responsible for several hours of no internet periodically.