Another thing that seems to cause instability over and over again is using the non-native tool for the synth. Each synth seems to have a favored tool. For mass production synths, determining which tool is native is pretty easy. It is always the one in which you can get High Yields as opposed to High Quality. For finished items and others, it is a bit more difficult to pin down and usually takes experimentation to figure out which tool works best. Sometimes common sense applies, but not always.