I may have solved my TV wifi problem. It lost it last night and I saw the door was closed for the room that the router was in. Opened the door and TV wifi started working again.
Other devices were fine, so looks like TV needs stronger signal, will work with closed door but intermittently will lose connection with door closed.
Opening a door is a lot easier than wifi extenders or cable runs, so will leave that as solution for now.
Don’t know what brand of TV will buy next time, since smart TV’s have only had LG. Not looking at moment.