no sound from halionsonic 3 se

This is my first post! Welcome to me. I am new but somehow I got everything to work for a whole year!!

well this new year I wanted to listen to some of the songs I worked on and I realized there is no sound coming from Halion Sonic 3 SE.

See error message that comes up ONLY sometimes. Not all the time…
A serious problem has occurred. Please try to save your project etc. I am using cubase 10 but the error says 9.5 exe. Confused !
Thannk you!