First, the strawberries must be completely dry before dipping. Otherwise, the chocolate will not adhere correctly. For best results, allow the strawberries to air dry for at least an hour before dipping them in the melted chocolate. Second, to avoid chocolate that breaks apart and falls off the strawberries when you bite into it, use one tablespoon coconut oil per cup of chocolate chips (be sure to add some form of oil to the melted chocolate prior to dipping. Third, don't over-microwave the chocolate!  This will make the chocolate very hard and unusable.