I'm working on simulation of mobile base (gazebo as a environment for ROS project). During short tests (minutes) everything works as expected. If simulation last longer (> 1h or so) model starts to behave like its center of mass has changed?
If you have any ideas why will be appreciated.
I've attached some pictures and video to show what I am talking about and [sources of the model](https://drive.google.com/open?id=1Gk9834iySl7t5MK6JUG18ceLQKbuuG7w)
Mobile base leaning to front even if center of mass is at the back
[Strange behavior in video (in the middle of the film)](https://youtu.be/MvaakM-4gpU)
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