OPLab doesn't output CV


My OPlab doesn’t output any CV or gate signals anymore. The trig out works fine for sending out trig and PO signals. And the lights on the back of the module are lighting up when I’m switching on the device.
But the lights on the CV out are not lighting up, when I’m selecting the module track to play something on the musical keyboard. Also no CV signal will be send out to my modular rack. I’m on the latest firm ware for the OP-Z and the OPLab and a couple of weeks ago when I used it the last time it was just working fine.
Any idea what I could do?
Cheers, Hendrik