Sorry for the long text.
I currently have a UN50TU8000FXZA, Class 8 Series TV and I have been having connection issues. I've had this TV for 6 months now and it has worked flawlessly, until now. I have been connected to the same wi-fi since the beginning, and there weren't any issues. Then after I turned on my TV the wi-fi wasn't connected, it told me to check my network connection, which I did, but it would show me that the TV wasn't able to connect to the router. I retried many times, and even reseted the network settings, but nothing worked. I held the power button for a quick reboot, but it still didn't work, so I performed a hard reset, and when I turned it on, it would still not allow me to connect to the wi-fi, so I kept pressing retry and it worked! Then I went to sleep and when I turned on my TV the next day, there was no internet connection again, so I performed a hard reset again, and the same thing happened. I pressed retry many times, and it worked, so I installed everything again, which takes a long time, and then I turned off my TV, and for the third time, when I turned on my TV, the TV wouldn't connect to the wi-fi.
What I've tried doing: turning off/on my modem, reseted network setting, factory reset, DNS 188.8.131.52, soft reboot (holding power button).
I may have tried other things I forgot to mention, but I really like this TV and I hope that I’m able to fix it myself.