Hello, I tried to purchase an app yesterday and couldn't because it required iOS 7.1 or later. I'm running 7.02 and have never had any issues. From the reviews I've read from several sources, it seems as if every subsequent version has had bugs and causes problems like excessive battery drain, etc. Can anyone please recommend a decent version to go with? (I'd like to stay with 7.X/7.X.X.) Thanks very much!