Got a 4GB Pi 4 recently, after flashing the newest Raspbian lite using etcher I got this error message: "mmc0: error -110 whilst initialising SD card".
Tried both Sandisk 128gb extreme and Sandisk 32gb Ultra, same result.
Test using the 32gb card on my old Raspberry Pi 3B and it's able to set up and boot as per normal.
Did I get a lemon pi 4? Sorry for my English.