No playback in Groove Agent and Halion Sonic they play then cut out with no sound

No playback in Groove Agent and Halion Sonic they play then cut out with no sound. My other VST instruments play find. Is this a Cubase glitch and is there a patch to fix it?

I’ve been experiencing the same thing for the past few days. It turns out the instrument randomly decides to mute within the VST GUI. It doesn’t mute from the track, but within the VST itself.