When I first got my s4, I could connect to WiFi but it was always so slow that it was unusable. The prior update (4.2.2?) improved WiFi to where it would work some of the time. Now with the latest update, I've yet to find any WiFi that works. Most of the time it won't detect any networks but when it has it struggles to connect. Every time it just says that its unstable. Does anyone know a fix for this? Thanks.