I also faced the same issue. And then I replaced my SIM card. Now everything okey.
Move closer to a window or door, move from under a tree, that is some of the troubleshooting steps you will get from your "Team Of Experts." When that doesn't work you will be told to upgrade your phone.
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You may refer to the links below for troubleshooting. If nothing helps, please don't hesitate to Contact Us. You may request for a technical support right away so we can check the actual location you are at, as you mentioned it happened to both devices. Thank you so much!
The links above lead to a great place to start for troubleshooting. Please give them a shot to help get these issues fixed.