Image doesnt show image from url

Hello
I use Image in XAML and set to the Source URL. But in some cases, I don't see loaded image. The same URL. I can click back button and then navigate again, the image is loaded and I can see it. It doesn't depend on the URL. So, the problem is: I don't see loaded image in 100% cases. Maybe I should update layout or check when the image is completely downloaded, but I don't find these methods.