I've been having this problem with my Acer Nitro 5 (AN515-54-728C) for about 2 months now. I've owned the laptop for more than a year now and the problem only started around 2 months ago. The laptop seems to randomly stop charging under heavy load. Its random when it happens, I can be gaming for hours and other times it happens 5 minutes from booting up the exact same game. I make sure to only game while the battery is at 100% but it still happens. This has happened with the original adapter, and two replacements I bought because I thought the A/C adapter was the problem. I'm thinking its the battery but I don't really want to dish out any more money until I know for certain that I need a battery replacement. Anyone else have had this problem? If so, how did you fix it?