SynthesizerMadness
I get this as well. Embarrassingly for Cakewalk this happens in their own SONAR X1,,,, changing presets doesn't help, deleting and re-adding the synth to the track doesn't help either. Only thing that you can do is save and restart the host. This does not happen on the standalone version.
I haven't really used it outside of Sonar, but you are right. I cannot replicate the fault at all in standalone mode - works every time. Clearly a Sonar issue then. Kind of makes it worse knowing that they didn't even bother to test it properly with their own host program.