re: Sony SmartTV Lagging

Have the same problem with mine. (same year as well) Have to unplug the TV for a minute at least once a month or, if that doesn't work I have to "factory reset" the TV. (I do this about once a year)

It's the smart function interface firmware. I've done extensive research on this and the above is the only thing that works for us.

Or add a firestick, et al to it and don't use the internal smart system.

Good luck!