I have recently replaced my Samsung HW-Q90R with a Samsung HW-Q990C. One of the main reasons for replacing the older item were the problems with WiFi which continually disconnected, unfortunately I have the same problem having spent over £1000 on the new system.  I have not contacted Samsung as there is little point, they either do not answer or suggest there is a problem with my Wifi signal at home. There is nothing wrong with my WiFi I have many devices connected to WiF and they do not drop out at all. There is no doubt in my mind that this is a Samsung problem, not only have I had two Samsung systems with the same problem but reading on here, there are many others suffering the same problem. I do hope some one from Samsung reads this and comes up with some way of solving the issue.