I think that's the same issue as this bug: I'm having the same exact problem when using any Kontakt patch, it's not isolated to just PLAY. It also just started happening in 4.25, it's never occurred before. As per the above bug post though, they seem to have a fix in 4.26. You can get 4.26 from the pre-release forum to see if that solves the problem, I haven't had a chance to do so myself unfortunately.