I am using 2018 Standard, SP4. I have an assembly and I delete all the attachments to a part and pull it out, and then turn it around and reinsert the part back into the assembly. The part did't have any attachments when I pull it out so it should be free to rotate. I pulled the part out of the assembly, but when I click on the part and try to rotate it so it can be assembled correctly, the whole assembly rotates with the part preventing me from reinstalling the part. I tried deleting the part and reinstalling it again into the assembly but it didn't solve the problem. It seemed to just happen out of the blue!! Any solutions??