Back navigation is broken in a scenario with default animation and app suspend / resume:

1. Create app with root frame and two pages that simply navigate forward / backward to one another
2. Suspend the app and then resume it
3. Navigate forward from page1 to page2
4. Navigate backward from page2 to page1
5. Try to navigate forward from page1 to page2 again -- fails.

Workaround is to not use default animation i.e. specify transition when navigating:

    args.object.page.frame.navigate({
        moduleName: "home/third-page",
        animated: true,
        transition: {
            name: "fade",
            duration: 380,
            curve: "easeIn"
        }
    });