Its just not working

Ive only had this app a couple of weeks but twice in two weeks the app has simply quit about 3/4 the way through, and there is restarting where it left off! Also, the GPS doesnt work, it never tracks my mileage (which is quite a downfall since some of the runs are based on mileage), it just doesnt work! Please fix!

RN4Hearts about Easy 10K - Run/Walk/Run Beginner and Advanced Training Plans from 5K to 10K with Jeff Galloway