LayoutTo is moving again after a short time

I have an AbsoluteLayout named “View1" that is used inside another AbsoluteLayout.
When I click on a button I fire the following:

var newPos = new Rectangle(12,190, 287, 142);
View1.LayoutTo( newPos, 500, Easing.SinIn);

This works great but after anywhere between 10 and 30 seconds it moves to the top of the screen. I’ve put breakpoints everywhere and it never hits one.

Has anyone seen this?
Any help is appreciated,

Thanks
Brian Williams