https://www.theregister.co.uk/2019/07/10/pi_4_usb_c/

Mere weeks after launch, it appears that the hot (in more than one way) new Raspberry Pi 4 is a bit finnicky when it comes to power cables.

The new Pi arrived with all manner of exciting tweaks and modifications including a couple of 4K HDMI outputs, more memory for those who wanted it, and a speedier CPU. To keep things powered, the Pi team opted to switch to a USB-C connector from the micro-USB it had been using to date.