I'm not totally sure why the program is reporting your particular setup as unstable. I duplicated your study then went into the study properties and set the following:
- Disabled "Compute free body forces"
- Enabled "Use soft springs to stabilize model"
- Set solver to "Automatic"
The program then solved down to what you see below. It doesn't seem as though any bodies are disjoint and nothing seems to be translating beyond ~1 mm. So, like I said, it doesn't seem like it should be unstable. In any case, you may want to set the same settings on your end to proceed with your analysis.
Thanks for that, yes when I changed those settings it runs fine