Hi syz-x,
I've been trying to reproduce your issue for quite some time now, but I don't seem to have any sync issue, and even less crashes when tweaking parameters on my Spark CDM controller.
What kind of setup are you using ? Might it be that you have a lot of plugins open at the same time and somehow the CPU would be overwhelmed, which would cause Spark to lose sync ?
I would need to have a way to easily reproduce this phenomenon if I am to find a fix for it.
Thanks