APU EGT down to 0-100 °C

[Domarien]

Hi all,

I have a weird behaviour of the APU on the RJ Professional and the 146, which I haven't found on the forum. I am using MSFS 2020, latest patch.

I start the APU normally. RPM and EGT increase normally. APU Gen is on. APU Air is off.

After a few minutes, sometimes more, sometimes less, the APU EGT goes down to 100-200 °C. I also had the EGT just drop instantly to 0 as if I had pressed "Stop". RPM is still 100 %.

Only if I change something with apu air on or off, one pack on or off, the EGT begins to rise again to 450 °C. But this only stands for a few minutes. Then the cycle begins again. I have no idea, what is causing this.
Also, the Cabin Temp sometimes falls to 10. This sometimes happens, if I change my view to the outside view.

Has anyone else seen this behaviour?

Thanks in advance.

Best regards,

Chris