I posted something like this in another thread recently. Where I live I'm on the fringe of a LTE tower and never have more than one bar (and often showing none). Turns out that when LTE network is bad the phone will switch back and forth between LTE and 3g, causing me to receive text messages sometimes more than 20 minutes delayed.
All I have done is switch to 3g preferred in network settings and everything's fine. I also have significantly better standby battery life, as the phone isn't changing back and forth anymore (that and LTE will always use more battery anyway).
Hope that helps/works for you.
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