Question why my charger socket get very hot and stop charging when I open heavy game or program?

[YaSsOo]

my laptop is Lenovo l340 ideapad 15irh. and I changed to a new charger worked well for some days and did the same thing.

 

[helpstar]

which charger did you get? wattage and voltage?
the original should have 135W

it might stop charging because the workload needs too much wattage to run the laptop and the battery can´t be charged anymore