Thanks for your comment, really helpful to hear from someone using the same software.
I did some more testing earlier, and am pretty sure part of the issue is when 'Local Control' is set to 'on'. At least, the freeze happened fairly soon after I switched that on. Just confirmed again right now, DAW is stable until 'Local control' is set to 'on'
I'm transmitting via usb. I saw some posts on other forums where people had to use midi cables to get things stable., so if you're using usb with Cubase I really hope you can help me figure this out... currently I've got an awesome synth that in effect becomes a desktop with no front panel when used with Cubase haha.
Maybe it's relevant, but I've been unable to work out how to use nrpn with Cubase so have it set to trans / rec midi cc, so out of interest how are you automating parameters from DAW? I found a pretty longwinded guide to setting up a hardware instrument in Cubase via creating a new midi instrument panel, but it involved setting up each individual knob, slider and dial and designating it nrpn... is that what I need to do? Longwinded or not if that's what needs to be done I'll set some time aside tomorrow.