I have a port extension usb with switch and I connected a usb tp-link bluetooth 4.0 (reccomended) once the internal bluetooth stopped working and servicing the 4 ruuvi devices and a sub gps devices. the second port I use it for a ve.bus/usb for my shunt connected to wind generator. However what is happening is the my usb gps now appears and dissappera. 1) can you suggest usb port extension that works with cerbo? 2) can I use the 3rd port usb on the cerbo?