Please try switching to 3G (CDMA) only and then back to 4G (LTE) as this may improve your 4G connection.
From your main screen:
Menu>Settings>Wireless&Networks>MobileNetworks>NetworkMode>CDMA only. Go back to main screen and power phone off/on. Then repeat above steps and select LTE/CDMA and power phone off/on to ensure proper switch to LTE/CDMA option.
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