Scratch

Ok, every time I try to make a running thing that has like 20+ frames, crash slows waaay down when I duplicate the earlier scripts, and then recently scratch said it was running out of memory and then eventually crashes and I lost a lot of work I did, why does this happen?Could this be fixed in a later version of scratch?By increasing it's memory or something? Please help, it's happened to me several times, but not as bad as it did this time, and scratch lost everything that I had been working on, it even stopped showing it's picture and instead showed the window that I had up before it, so is there any way to avoid this?