Since the June ROM update, some devices have started sending stop commands to the current media session running on the device, usually every 10 minutes. As expected, the app processes the command and stops playback when it receives it. To mitigate this issue, you can go to Settings > Player and enable the setting called 'Ignore MediaSession OnStop command' as a workaround until Google fixes the issue. The device will continue to send this command until the ROM gets fixed, but the app will no longer process it.
The algorithm for extracting chapter information from show notes and timestamps has been enhanced to support a wider range of formatting options.