Cubase 10.5 controller problem

Hi folks. I upgraded a few weeks ago to 10.5, using my Roland Fantom 6 as the controller keyboard. For some reason, a couple of weeks ago, the Fantom stopped contolling the sounds. I’ve been into the studio settings in Cubase, ensuring the Fantom is the driver. I can hear the Cubase sounds coming through Fantom if I ‘mouse’ on the Cubase virtual keys, but not if I use the Fantom keyboard. Haven’t heard back from Steinberg for the entire time. Can you possibly help at all? Ian.