Hi,
I've had a similar issue flying South West out of Luanda (FNLU) at 1500', I get to Lat -9.099915° Long 13.000687° and the A2A Comanche just 'crashes' in clear air.
Is this P3D code or Orbx?
i7-7600K, GA-Z170X- UltraGaming, 16GB 2133MHz DDR4, Gigabyte GeForce GTX 1060 Windforce OC 6GB, Windows 10
FSX, P3D v4 and MSFS