Powered down laptop heating up when plugged in

[VWood]

I have an Asus A15.
Usually when I am done working I unplug the charger.
Yesterday, after I shut it down, I left it plugged in. Today, as I was about to turn it on, I noticed that the laptop was considerably warm to the touch. The majority of the heat was at the back where the heatsinks are.
This leaves me with the uncomfortable conclusion that either the CPU or GPU was generating heat (without the fans blowing). But it was shut down.

What could cause this?
Is there a way to fix it?

 

[Scarlet12]

Your Asus A15 may not have fully shut down and could be in sleep or hibernation mode, causing the CPU/GPU to generate heat. Another possibility is USB power delivery or fast-charging features keeping components active. Try disabling "Fast Startup" in Windows and checking BIOS settings for power-related options. If it persists, a BIOS update might help. For managing power settings on mobile, tools like Scarlet iOS can be useful.