I totally agree, both my two previous televisions suffered from this phenomenon.
If possible, turn around the pcb and check all the solder pin connections. If possible resolder them with a tiny solder point/tip.
The old stuff could cause health issues if you got enough of it in your system and was just bad for the environment so they stopped using it.
Yeah, but it was so much better than the new stuff. I still have some old S39 liquid for better soldering.