Mine keeps losing Wi-Fi for some reason. Not for very long, but I get the on screen warning come up every now and then....Experienced a weird issue yesterday. Lost Wi-Fi. Thought it was my router. Restarted it. Unplugged TV mains power. Put it back after 10 minutes. It connected to Wi-Fi but speed test app was showing 0. Everything froze. Gave up after 30 minutes. I was able to get Wi-Fi at advertised speed on other devices including my ZD9.
Now its fine. For a moment, thought the Wi-Fi adapter on the TV is blown.