Crash

So I just spent 5 hours creating a video on Rush, loading an MP3 file I recorded earlier, 45 images to be included, title from the graphics selection and got half way to completion of editing. Went to get a drink, came back 3 minutes later and the entire file had crashed and appears, an hour later, unrecoverable.  Having looked at the Community discussion re this topic, I note that there are over 500 pages and no authoritative answers, just questions asked in return. So, am I an idiot for purchasing this programme? Or are there very serious problems with it? Those are the only questions I can think to ask.