Share your experience!
I have a KD-55XF90xx TV that has started losing Wi-Fi all the time, sometimes constantly on and off for a few minutes. I’ve put other devices next to it and not losing signal.
Have you got the latest firmware installed? If not update and see if that fixes it. Other than that it would be best to hardwire it if you can. And just an afterthought, have you recently installed some third party apps? I installed a CCTV monitoring app on my TV and it totally broke everything, took me a few hours to realise it was the app!! So have a think...👍
If you are using WIFI booster, turn this off and try the main router, it worked in my case