App Shutting Down on Vivoactive 4

Hi,

I have an app that is intended to run continuously (it sends accelerometer and heart rate data to the phone for analysis - https://github.com/OpenSeizureDetector/Garmin_SD).

It works fine on my Vivoactive HR and Vivoactive 3, but a new user is trying to run it on a Vivoactive 4 and he is reporting that he has seen the app freeze and also shutdown unexpectedly.   I am wondering if because this is a new device, have there been some sdk changes that I need to incorporate that I may have missed?   I can't spot anything in the documentation, but I know when I was trying to do this on a Fitbit there was a powersave feature I had to inhibit to prevent the app shutting down.  

Any thoughts would be appreciated

Thanks


Graham.