Why does restarting my phone give me back 4g lte?

I bought a Motorola e4 plus and it works fine most of the time, but it will eventually lose connection and will only use data at 3g speed- sometimes less, or no connection. I have to restart my phone just to get my connection back. This happens everywhere I go. My old phone never had this problem.

My phone is a 7.1.1 android. Do 8 have to download old firmware, reinstall this firmware?

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