halion 6 problem..loss of sound

im having issues again with halion 6…if I load it up and use a few channels it soon losses all sound.

ive also noticed it looses sound if I load it up and don’t use it for a few minutes while I goto the toilet or get a drink ill come back and no audio will work and then Cubase crashes if I load up another vst.

also halion 6 is using up a hell of a lot of cpu power compared to other cpu hungry plugins such as sampletank 4/kontakt6.

any help please