I have recently bought another Samsung smart tv for another part of my house.It is a 5500 series.I have found when ever you switch it to standby it disconnects from the internet it retains the connection to the wifi but goes no further,to remedy this I just remove the power to it for 30 sec and then power it back up and it immediately reconnects.My older smart tv never has a problem.I have a wifi extender that the new tv operates through, my laptop tablet etc all work through that with no problems.It would be difficult to hard wire to the router as it is up stairs in a different part of the house. My discussions with Samsung help desk have all centered around the DNS setting which they have got me to change to 8844 ,but it hasn't resolved the problem.Thought I would see if anyone had any suggestions before I go back to Samsung.Or I could just put the tv on a time clock to switch of and on each day.