String Glissando playback

Hi,

When I started to compose a string quartet, Dorico would playback the glissandos correctly but suddenly it started to glitch. There’s a particular glissando between an interval of a second: it starts to gliss. but then the second note is not correct (it’s playing a second lower than it should). I already tried restarting Dorico. Any tips?

I forgot to mention that sometimes one or more instruments playback out of tune…