I recently had trouble with apps in app store but somehow it fix it self not sure how but now win I try to download an app a error 1004 shows up or when finished downloading I would press the app I just downloaded the screen goes back to the home page

Um key I recently send a text to app store saying I was unable to see any pictures from app store or iTunes. But somehow I am able to see them now. my problem is now when I try to download an app an error 1004 shows up. I was able to download a few apps but when done downloading I would press the app but goes back to home screen also just now I upgraded an app I already had & that app is doing it is well how would fix this problem or do I have to get it fixed