Grey Screen

When I get on the app the thing pops up (the people and numbers) but only for 3 seconds after those 3 seconds a blank grey screen pops up and stays there after about 10-15 seconds a blank black screen pops up idk if its my phone or the app but could u fix it sometimes it works and sometimes it shows the grey and the black screens for now I rate 2 stars sorry plz fix

Monsterhighrocks111 about Fake-A-Call Free ™, v5.08