Wow - I can’t believe this thread is still running - I was just checking the forum as I can’t find something under key cmds.
Anyway I did leave using Dorico for a while, and following problems with other programmes as well I ended up swapping my Steinberg UR44 out and plugging in a focusrite scarlett 2i2 instead. Things seem to be working ok now - So it seems the problem was maybe the UR44 - which is annoying as I would much prefer it to using the focusrite.
I can’t imagine everyone having the problem has a UR44 but that is the thing that seemed to work for me.