Strange Flight Model behavour

[Scoobyon]

Hi, Was messing about doing some aerobatics and whilst doing tumbles with full stick and rudder inputs, the aircraft FM kicks and adds random forces, I have a clip of it here
 

This was unlimited fuel set at 35%, default weather over Senaki and was at full control deflection during the issue

[TheSkipjack95]

Encountering similar issues, FM feels like it stops calculating below a certain speed and it freezes the attitude of the aircraft until speed picks back up.
Impossible to perform pedal reversal too, despite flying by the book. Nose just doesn't swing far enough with full pedal, and doesn't drop through gravity.

track attached with a few of the offending maneuvers. ISA day, 50% fuel

 

PostStallFM.trk

[Manano]

Hi
I encoutner the same issue. A friend of my dad who is a retired MB339 Pilot of the Peruvian air force did a Lomcovák and while exiting the maneuvre the aircraft started flying "slewing" to the left and exploded midair.

I reproduced the issue with multiple fuel quantities.