Apps reloading when switching apps

Yesterday I went for a longer hike and turned on battery saver; although komoot always warns about it not being able to record with the saver turned on, it’s always been working for me. Did so for some time yesterday, but when I felt like listening to a podcast and turned on AntennaPod, almost exactly after one minute of screen-off the playback stopped and the komoot tracking was paused. I reproduced it once, trying it again.

Turning off the battery saver, it did not occur again, I did not play AntennaPod much longer though, because I wanted the saver to be on. Then komoot recording worked for the next hours without interruption again