LTE drops out..

[Saywhen13]

LTE drops out and leaves only 4G..on galaxy s4, at&t network. Replaced sim card today, no change. I can change in and out of airplane mode, and on occasion LTE 4G is displayed..but temporarily. Also drops out all together, about 10-15 times a day. Get the circle with the line through it for almost exactly 1 minute, then the bars and 4G symbol are back and things are working fine again.. This problem(s) started a month or 2 after the lollipop update so I'm not sure that that is part of the equation here.. Any suggestions?

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[B. Diddy]

Duplicate, see response here: http://forums.androidcentral.com/samsung-galaxy-s4/583803-lte-drops-out.html. Thread closed to prevent parallel discussions.