Apps will not update

Yesterday I had two apps that needed updating. I went to the app store/update and did the update, it would start then quit. Nothing would make them update. I tried deleting one then reinstalling but that will not happen either. These are free apps (Lowes & Sears), I do not have a lot of apps on my phone, only one app is purchased. Ever since I downloaded Apples last update to the system crazy things have happened. I could not change the default ringtone, finally found an answer for that. MS Outlook could not download/see contacts from ICloud, finally found an answer for that. Can't seem to resolve this issue, tried several things I found in support groups: changed date to one year ahead--no go. Tried resetting network, no good. Anybody else have an idea?