Upgrading the RAM is very straightforward, and should help some crashes.
To add to Jack's reply, if you're working on a long timeline, zoom in as much as you can to still be able to work. This seems to reduce the crashes for me. On programs with hundreds/thousands of cuts, things get very sensitive.
I work on sections, piecing them together at the end. It was either that or buying a wig after a great deal of hair pulling. :o)
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