Hi, One of my apps contains a very small and simple tracker, which basically updates the user's live position to the DB every 5 seconds, and then their friend can see this on their device. It has been working fine for all of my users apart from one user, who is using an iPhone 5s. It works fine for him when he has the app open on the screen BUT when he minimises the app, the app no longer updates his position in the DB. All of the other users and devices work fine in the background. Has anyone ever come across this before? Thanks in advance for your help.