@jimit

Thanks for your reply, I can't reload the Factory Test because the computer can't detect the COM port when I connected the device by USB cable, I guess the board already have something defected.

Refer to your picture, the heat is mainly come from the CP2014, do you have any idea what's wrong?

I will still order some M5Stack but very hesitate to use the battery even it is one of the big reason I love this device.. That super heat may cause big trouble if the board have something wrong (or I do something wrong....) : (

I got my first M5Stack core few days ago and I really love this device and want to purchase some more.. I develop a test clock program, put the device in my room and just want to let it run. (connected with usb power) but just now I found the device is super heat....

I turn off the device immediately and I'm very worry it will cause some safety issue because of the battery inside it....

I take out the bottom, power up the device with usb only, the device still running, still heat... and seems I can't detect the COM for this device anymore..

Anyone have this problem too? I really love this device because of the size and the build-in battery.. but now I'm more concern about the safety issue.. any comments?