Playstation desynth issues are relevant for PS3 only and are about desynth function freezing when called from desynth menu, not about decreasing the level. However patch notes also mention that if your desynth fails it might decrease your level however it doesn't specifically say at which (e.g. if on the same or other) class.

Dark: what your total of desynth levels - is it already over 100? Have you had any failed desynth on WVR?