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You may not be trning the key hard enough, like my cabbie, they seem to all have the same problems eventually. It sounds like a bad idea, and don't do so in an angry way, but make sure to twist your hand hard, and strong when you go to start her. Be sure you're pressing the brake what you're starting her, and twist HARD.
You may have already tried this, but have you tried turning the key 'hard'? It sounds like a terrible idea, but when you go to turn your key, twist your hand quick, and strong. It'll feel odd, and 'click' and then it'll start. If it backfires, it's rather normal. Mine does every now and then when I start her.