Sub 37 NRPN Issues

Has anyone else experienced problems sending NRPNs to the Sub 37. I’ve got my keyboard controller configured to send NRPNs to do some things like ARP ON/OFF, ARP LATCH ON/OFF, FILTER TYPE and more. Every one of the commands works as it should but after a session in which I send more than a couple of these NRPNs, the Sub 37 stops responding to them. Sometimes all of them are ignored, sometimes one or more NRPNs are ignored. I can see MIDI light come on in response to the commands and a MIDI monitor verifies the correct NRPNs are being sent. I have to restart the Sub 37 to get it to respond again.

I am updated to the latest firmware 1.0.7

Mark