I sometimes encounter the issue that the equation manager is acting strange, and that is the sign of the file corruption.

Here I have an image showing it. Normally I only have "delete equation" and "disable equation" option, but above image shows "supress" "unsupress " and "delete equation". At some point of the assembly with external reference, the right-click menu of the equation manager changes like that.

After this menu had appeared, the file acts differently (configuration is buggy, frequent freeze / stop working of Solidworks) and there are no solution to fix it (even I delete all the external reference or all the equations, or all the features), so I had to discard that file and start from the scratch.

Is there any solution for this issue? Currently I don't use external reference because of this issue, but it's much convenient that I could use the external reference, so if you know how to prevent / fix this issue, please let me know.