Our app had a 3.2 star rating because of constant crashes on Android. We tried fixing it ourselves for months. Thinksparkenergy found three major memory leaks in two days and had them patched within a week.
The crash rate dropped from 4.8% to 0.3%. Our rating climbed to 4.4 stars over the next month. More importantly, our active users actually started growing again. Worth every dollar.