Software component associations are removed from Software Product if the Name is changed. This issue was seen using the following process:
If you check the option: Include components assigned to other products,
it reappears. If applied, it will show that it will change the assignment from blank (nothing) to the current Product.
This issue is fixed in version 8.5.
For version 8.1 RU7, a point-fix is provided to address this issue.