Unable to load google map while changing view

Hi there,
basically my problem is that I have two pages app and both have google map on it but my problem is that I am unable to load google map while navigation between to pages

In details when I open the first page of my app it show google map but when I navigate to next page it unable to show the map. An when I reload second page it start to showing map and then I navigate to first page it not show map.