Still working on this issue…
I removed ALL the VST Plugins from the VST Folder (the only VST folder I am using) leaving only the VST3 folder active:
Oberheim SEM V.vst3
WaveShell-VST 9.1.vst3
Wurlitzer V.vst3
HALion 4.vst3
HALion Sonic.vst3
Padshop.vst3
Retrologue.vst3
slm128.vst3
But still Cubase crashes, from time to time… on quit.