Crashing

Hi, Draftsight keeps crashing when I ask it to copy or rotate or mirror, even on a small amount of entities such as the floor plan or elevations of a building. If I greatly reduce the number of entities selected, sometimes I can get away with it, but mostly it crashes and I have to then change the .dds file to a .dwg file to open it up again. Its driving me bleeding mental tbh. Is there anything I can do to stop it? I have unloaded and reloaded the software but it still happens. Ta.