Orbital drift, weird issues with rootparts

[Cheesecake]

Hello,

since a few days I have a problem with unstable orbits (orbital drifts). After starting a sat and release it from my rocket the Ap und Pe are very unstable, growing and shrink every few seconds. I did a reinstall of KSP (1.8.1), start a new Game. That dind`t change anything. Also sometimes after releasing the sat, the rockt is in a stable orbit and the sat has a negative Pe so it deorbit.
The orbital drift compensation is on (default) in the settings.

Here is my log:
https://www.file-upload.net/download-14230930/KSP.log.html

And here is a new one:

https://www.file-upload.net/download-14249954/KSP.log.html

Edited September 3, 2020 by Cheesecake

[Entropian]

Is this while timewarping?  If so, it's been around for ages and it doesn't seem likely that it will get fixed.

[Cheesecake]

No, not in Timewarp. In Timewarp the orbit is stable.
There is no engine or RCS onboard.

Edited August 13, 2020 by Cheesecake

[Cheesecake]

A new issue has appeared.
I launched a sat with my rocket. After reaching an orbit and releasing the sat from the upper stage, the upper stage was in orbit furthermore. But the sat had a negative Pe so it deorbited.
Here is a new log:

https://www.file-upload.net/download-14249954/KSP.log.htm

 

[Cheesecake]

And again a new issue:

If the rootpart isn`t inside the fairing, the acceleration during launch goes up the first meters after start, then goes nearly to 0 at a height of ca. 2000 Meters. After that, the speed increases slowly again.

- rootpart is outside of the fairing: acceleration is very bad. At MECO (main engine cut off) I reach a Ap of only 56 km by a speed of mach 2.5.
- rootpart is inside the fairing: acceleration is OK. At MECO i reach a Ap of 220 km by a speed of mach 6.7.
Test with stock-fairngs and SAF.

[jimmymcgoochie]

Since you’ve posted in the modded installs section, I’m going to guess that you’re using mods- if so:

What mods? What versions? What version of KSP and which, if any, DLCs? Try to find Player.log/Player.txt instead of the KSP.txt log as the former has much more detail in it, and/or add screenshots/a video as it sounds like this would be easier to understand by seeing it.