This sometimes occurs when the graphic adapter is drawing too much current. Typically happens when you are gaming. Basically, what happens is that when you are heavily gaming, your graphic adapter becomes the main consumer of the power. When the current drawn from the charger is reaching the limit defined by the manufacturer, the overcurrent protection is triggered and all current is stopped. In this case, the laptop reacts as if the charger was disconnected and switches to the battery simultaneously reducing the CPU and GPU clock frequencies. After a while, it detects the charger and attempts to switch power source to it and the whole thing repeats again.
I have heard that several Asus laptops are suffering from this issue. It often happens that the laptop is compatible with more than one model of charger and the manufacturer supplies the one with the lowest power rating.
- One way to address the problem is to buy an adapter with higher power rating that is still compatible with your laptop (make sure to check compatibility).
- Another option is to play around with your graphic adapter settings and also change game settings to be less demanding.
- One more alternative method is to run the laptop without the battery. (Obviously, you will need to shut the laptop down before removing the battery). Sometimes this resolves the problem, though resulting into the lower performance in the games.