Asus ROG Strix G531GT freezes/crashes after plugging in.

My ROG Strix G531GT works fine when on battery, boots up fine and everything, but the moment I plug it in, it will lag out occasionally and eventually just freeze up entirely, leaving me with no choice but to hold the power button for a force shutdown. After that, it won't turn back on either by pressing the power button. I've noticed that sometimes, if the device is plugged in before powering on, it would not start, or would freeze within a span of 5-10 mins. All the drivers were updated.

Could this be a motherboard issue? My exhaust fans did occasionally make noise, so I'm worried that the fans might be the culprit, I had them cleaned for dust and reapplied thermal paste 2 months back, and temps, while not exactly low, weren't way too high either. Before I spend money on replacing the fans entirely, I just wanted to know if there is something else i need to troubleshoot or look into?