So I had a closer look:
There are 14 crash files in the diagnostics and 12 of them show the same pattern,
the audio engine crashes while the shutting down. I.e. it receives a quit command from Dorico and tries to shutdown, when it runs into this error condition.
Half of these 12 crash files point directly at Pianoteq as the culprit, but although the pattern looks same, the other half does not directly point at Pianoteq.
Anyhow, you are using Pianoteq 6.5 but the current release is 6.7. I don’t know if you are eligible for a free update, but would that be an option for you,
installing Pianoteq 6.7 and trying with that version?
Then there are 2 more crash files that indicate an error in the VU meter update handling. Occasionally I have seen such crashes before,
but they happen really rarely and we could never get grip on them, since we only ever saw this on customer’s machines and no recipe of how to reproduce.
Therefore we can’t chase it down, unless you help us by giving specific details.