very stable here. still have the experience of occasion 'audio meltdowns' when place a vst on a bus...usually a compressor, Waves, but not limited to the latter. Sonar, vst's, Win10, RME, no-one knows. But it's a simple matter of just turning down my monitor in anticipation, saving my project, then on occurrence, closing and restarting Sonar and it's all good...wish it wouldn't do it though.