WiFi issues---please help!

My phone won't stay connected to my home WiFi. I've tried the settings. It sometimes will stay connected for an hour or so and other times only seconds or minutes. My issue is not with my service provider (cricket if it matters). I have no clue what to do and I'm getting frustrated. Ready for a new phone but this phone is fairly new so I can't justify spending money on a new one if this one is fixable. The image below is what I get when I click on advanced settings. My fiance does not have the same issues with his phone.