I am in a situation where I am forced to only use wifi. And I am finding on a regular/daily basis that the wifi simply does not work. My phone is the Galaxy S5 and I am using Flight Mode. I have the wifi turned on and I do all my email and banking etc with the phone. But there are times that it can't reach the wifi in my house even though my laptop is using it just fine. I have tried to fix it by resetting the wifi connection by turning the wifi off and than on. That sometimes gets it to do a connection and away I go. Other times the turning off and turning on the wifi doesn't work so I than turn off the flight mode and than turn off the flight mode and reset the wifi. That seemed to work the best for me. It normally got things to work. But now at this moment that doesn't even work. So I am lost. My phone plan doesn't include network/mobile data. So that is why I am using Flight Mode. But when I am back home, my plan is turned back on and for the most part it uses 4G when I am sitting in a WIFI area?? Meaning that wifi never seems to work properly. I am made no changes with the phone in any way. Perhaps I need to upgrade something. Maybe new software or something. Any thoughts on what to do before my warranty runs out??