I'm having trouble downloading themes from Cydia. It takes forever to download something and throughout the downloads I get "hashsum mismatch" and I have to restart the download from the beginning. If I try to download the same thing on my iPad it downloads quick and has no errors. I don't know of its a problem with my wifi on my iPhone 5. I put a screen protector on the back of my iPhone because I don't use a case and I don't want it to get scratched. Could that cause the wifi signal to drop or not be as strong? I thought all the network signals came from the metal frame of the phone. I really don't want to exchange this iPhone. Everything else on it is perfect. Any thoughts?