HA on RPi4 with usb boot stops working after plugging in second usb device

Hi all,

i have create a usb flash drive with home assistant installed. Works like a charm on my RPi 4b 4GB (so without SD card present) But, when plugging in a second usb drive (in my case for my “slimme meter” (DSMR energy meter readings), the WHOLE system stops working. The GUI doesnt work anymore, but also SSH doesnt work anymore.

When I unplug the DSMR and restart the Pi, it starts working again. So I googled because I thought it may be have to do something with the USB boot, so I checked if the USB ports of the RPi have some sort of boot order, but Internet says that is not the case. Any idea what I can do here?

Thanks in advance!

Yeaaahhh ok, so, anyway, switching usb ports does seem to help…