Connect IQ 2.3.1 memory issues on 58kb devices

I have a watch face that seems to work fine on a 64kb style devices however I have had some FR735XT/ Vivoactive HR users running latest firmware reporting problems with trying to save values to the objectstore.

If the following 3 lines of code are commented out the watchface seems to work fine.

var app = App.getApp();
app.setProperty("lastLat", lastLat);
app.setProperty("lastLon", lastLon);

If these lines of code are executed then when I exit the application in the simulator after the onStop() function is called I get an error:

"Unable to serialize app data"

This error can also occur at random intervals if I am changing settings via the simulator running 2.3.x and VAHR.

If I run a FR935 with 2.3.x in the sim (or FR235 with 1.x) I cannot recreate the problem. My properties file is less than 1kb and the free memory available when I exit onUpdate is always around 4kb for VAHR and 37kb on a FR935.


Any ideas ? Is this a peak memory usage exceeding 58kb problem ? How do I confirm this and check what peak usage really is ? There used to be something show up on the status bar for the simulator but this is gone in the latest release ?

Thanks