Several apps won't open on my iPhone 5s all of a sudden, what can I do?

[iMore Question]

several apps won't open on my IPhone 5s, all of a sudden

facebook and two games will not open. They did 2 days ago. I have deleted them and installed again and they light up and then cut off.

 

[Ledsteplin]

Re: several apps won't open on my IPhone 5s, all of a sudden

Welcome to iMore! Are you on the latest OS, which is iOS 9.3.1? Is your wifi signal strong? Have you rebooted your wifi modem/Router lately? Have you tried a hard reset of the phone?
Hold the top or side power/sleep button and the home button at the same time until the Apple logo appears, then release.