Crashing during dissolving a component

 Bricscad Version 17.1.12 (x64) revision 46307 crashes while dissolving a self made components. I am finding it very difficult to make any changes in the 3D models. Another crash is while loading a model having approx. 600 components which worked very well yesterday and today when I try to open it, Bricscad directly comes out to desktop. It doesn't save other open files also. Is anyone encountering this problem?