I have a QN49Q60RAFXZA purchased in 2019. The tv recently will suddenly freeze for a few seconds. When it freezes, the screen first turns black for a few seconds with no sound, then the picture returns but it is frozen for just a few seconds, then the sound returns. The TV streams via wifi from a high quality router that is in the same room. The iMac on the desk next to the tv does not lose its wifi internet connection. Does anyone know of a fix? I have disconnected the electricity to reset the tv. But the problem reappears.