Have you done the new iphone update,i did it monday and my phone has been a nightmare ever since.My fitbit settings have changed and i don't know how to get it back to the previous settings.I normally connect to my works wifi connection but today nothing would load,luckily one of my workmates advised me to forget that wifi and reconnect and that has worked.Also my facebook app kept asking me to login last night and when i tried it said i had no internet connection. so had to reset that too so maybe try that to see if that helps.