I have reason to believe that the latest update of snapchat has butchered my phone, so much so I had to factory reset my phone multiple times almost losing 3gb of photos as even just being previously installed is enough to get the phone stuck in a boot loop and cause catastrophe lag. Not sure if it's something to do with my phone being old or something, either way, every app is perfectly fine other than snapchat :). I have an Samung Galaxy S6 fyi.