Time functions dont work

This app is simple and easy to use. However the timer function for breastfeeding doesnt work properly. Sometimes when the phone display sleeps it seems like the timer stops running. For example, I know I started feeding 20 minutes ago but the timer currently says 14 minutes. Also the start time for feedings changes randomly when you go to save the feeding. This makes it hard to rely on the data on how often my baby is eating.

JMisTrouble about Medela Family - Breast Feeding