Need some help. Iphone 4s was working fine.Have revcently upgraded IOS. Was still working fine until I decided to swap phones and needed to backup. Now no WIFI (Greyed out) This was unit was replaced last year due to a bluetooth problem in sofware. Any assistance? I am not ready for another trip to Apple as Im still getting over the last one and not mention 2 hours of lost small business time and thats how I get paid..