Strange effect with HALion SE

I’m getting a very strange effect sometimes with virtual instruments through Cubase 10.0.5. Everything is fine when I record it and usually fine when I reopen the session for the first few times… and then I get the effect which you can hear in the attached clip. I’ve never been able to solve it and usually switching to a different sound will work but… I really like the sound I’m using here and would prefer to keep it. It’s completely random and intermittent (it sometimes clears up by itself) so I’m not even sure how to trouble-shoot the issue. Any suggestions would be appreciated. Thanks.