We've heard reports of recording issues that can occur when using the Instagram or Camera App for iPhone to edit/upload photos during a recording with the Strava App. Using these two Apps at the same time allows for the potential to max out the available memory for the iPhone. This can cause the operating system of the phone to quit various background processes, including the phone's GPS.
What this means in practical terms, is that taking a photo or using any other memory intensive app during an activity recording can cause the iPhone to stop recording GPS data.
To address this potential issue, we suggest navigating back to the Strava App recording screen after using any app to check on the GPS status symbol and ensure the GPS is still active (check for green bars at the top of the recording screen).