Why do we get this fatal error?

I'm hard testing Pianoteq with literally millions of notes per hour for musical purposes. It performs simply great in tandem with MTS-ESP plus a self-made sequencer. Only bad side is it makes the entire project crash, whereby this fatal error window pops up (can't post the screenshot, content below).

Pianoteq 8.1.1/20230602/x86_64 fatal error
[fc5981df,dkil]

out-of-control[steinwny,251], please contact us : 1 0
-2.73337e+37 p=0 isd=0 dz=1 dr=0 pf=0 kn=104 lm=113
mc=0 ve=0.992188 a=0.636213 p=400 fn=0 rp=0

  Ctx{fc5981df=164000000,5b56c7,5b630e,
61e6e2,61e201,61d146,61cdf2,61ccd2,61cd02}

Polyphony set at 'Automatic (optimistic)' or 64 makes no difference. It does not seem to be strictly depending on any possible overload coming from my midi-feedback system since Pianoteq is constantly demonstrating itself to be able to hold huge amounts of both midi notes and change-parameter events at once with my system.

The fatal error may just occur at some random point in the middle of a live session, be that in 2 minutes just as well as 2 hours. So I would really appreciate some help and guidance in troubleshooting (hopefully fixing).

Could it be related to Pianoteq's undo history or the like? Does anything similar happens only to me?

I will provide more details if needed, of course. Looking forward for someone in-the-know to letting me know. Thanks!