venu 2 behaviour FIT and display issues

Hi,

Updated my app to work with SDK 4.1.2 and released my apps - basically had to shave memory down as runtime takes more space.

ERA is reporting that the following code produces an UnHandled Exception in a small population of devices...

if( Attention has :backlight ) {
    		Attention.backlight(true);
		}

on the line where the code tries to turn on the backlight. Devices are on 8.11 and 9.17.

A bigger issue is that on some Venu 2 (no other devices reporting issues) FIT files are not being created when the app is set up to do so via a setting. One user reports that starting the app then closing it then reopening and setting the setting to write the FIT file works. Disabling the flag in the menus on the phone and then enabling it again works very occasionally. 

Note this works fine in the simulator and on my own watch. No other watches have been reported. This FIT code management has not been changed but the setting ordering has been 
in the migration to the new SDK.

Why just the Venu 2 and only occasionally!! Sadly as the new watches don't provide any debug info on watch I can't get specific debug feedback.


Thanks,
David