The Critical message is an in-app alert to let you know your iOS device is getting hot. The MLM is still usable when the screen turns white. We turn off high CPU functions like the live video and instant replay, however we still capture the data and video from your shots and all swings are viewable in your session screen. We are working to improve the overheating of your device in each release. Next time you are out, please try to close out of any apps that you do not need running as it will also help with the CPU overload.