Hi, I'm experiencing the very same problem on my QE65Q9FN. Bought in November 2018. Beside IPTV I'm using only DVB-T/T2 tuner on this TV. The problem with signal not available occured just for the very first time when I powerred TV on. So the installation took several hours untill I tried to cycle-power. Than again after 2 weeks and for the first time yesterday July 4 2019. I have also problems with bad-signal-spikes when tuner randomly pixelate even when I have 100/100 signal and another TV box plays just fine (crappy cheap KIII PRO with coreelec and timeshift). I have tried to claim warranty about the random signal problem and the pixelations. Samsung says QLED premium support. What a JOKE. The technicial came, didn't even bothered to see a recorded problem. Since the problem was not obvious on his visit so he just did factory reset and leaved. So my next $3500 TV won't be Samsung. Pixelation with proof that signal is just fine by moving timeshift back on another TV box https://www.youtube.com/watch?v=61rGeXxCRCo complete picture freeze for 5 minutes https://www.youtube.com/watch?v=zB52FtR4KSM no-signal from December 2018 https://www.youtube.com/watch?v=puPy36I5zHc&t latest occurence of no-signal https://www.youtube.com/watch?v=uJa1V_o9wm8 So, return TV if you still could. I wish I would have did so. Support won't help, at least not me.
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