Have been in Mexico for 6 months. FaceTime to the US has worked flawlessly until sometime after March 4. That was the last time I was able to use it. Now it just rings but won't connect and finally fails. The only thing that has changed it that the US went to daylight savings time on the 11th but we don't change the time here until April 1. I checked my date and time and everything is correct. Any ideas?