Precipitation rain / snow doesn't work suddenly

While making different scenes I wanted to have a snowy environment. In testing this al was oké. A bit later I can’t get back the faling snow or rain.

Hello, @fmarchitecten

Welcome to D5 forum, sorry for the inconvenience. Is this the first time you’ve encountered this problem? What Version of D5 render you are using? Does the issue happen to all your files or only a specific one? Does the rain disappear after saving the scene and reopen? or just suddenly disappear? Have you checked your network? It is stable enough to work with D5? Or restart your pc or laptop?