IMPORTANT NOTE
If you have Android 6.0 and higher, battery optimization is used and the Android system restricts app running time in the background. When you turn off the display while recording a track in GPX Viewer PRO it may not record anything or record only some points. In this case, you need to
turn off battery optimization and also
turn off battery saver mode. Also please have a look at this website
dontkillmyapp.com as it can help you resolve these problems too.
If you have Android 10 and higher, please ensure that you have granted GPX Viewer PRO permission to always access the location in order for recording to work properly when GPX Viewer PRO is in the background or when the device screen is turned off. You can read more in this article
Google to put a muzzle on Android apps accessing location data in the background.
Greenify app can also kill GPX Viewer PRO while recording so you need to disable battery optimization in Greenify in order for recording to work properly while the screen is off.
You can also use
Memory Locker and
GPS Locker when you still have issues with track recording. GPS Locker will ensure that when the screen is off GPS signal won't be lost so GPX Viewer PRO should record track properly.
If you still have issues after trying all of the previous methods, it is possible that using some GPS apps like
GPS Status & Toolbox may prevent GPX Viewer PRO track recording from being in doze mode.