Phone intermittently disconnects 4g without notice or warning. What's wrong?

Every so often (sometimes as much as once a day) my 4G connection randomly turns off. Usually after switching between WiFi on/off. I notice that it gets stuck in 3G and I will have to manually go into Settings > More Settings... > Mobile Networks > Access Point Names > and check "LTE" back ON.
This is getting really old. Sometimes I will not even receive any service even if 3G is on. Data will not send/receive until I go in and manually check LTE back on again.
Is anyone else experiencing this issue? Any solution?

Settings > More settings > Mobile networks > Network Mode > LTE/CDMAI found this method caused other issues...such as not receiving service in some areas where Global would.
Removing the SIM card, leave out 5 minutes, reinsert SIM and reboot.Only temporary fix.
New Sim cardI'm on my second one...Best Buy gave me a hard time replacing my first one (apparently they're supposed to charge you for it...ha). I might try this again, but I am skeptical.
Getting a CLN replacement phone under warranty.What is a CLN? I have Best Buy warranty...I really do not want to send it out for repair or even get a refurb. Too much hassle. Would be last resort.
Returning the phone to Samsung for repair.Last resort...way too much hassle.
Settings > Application Manager > All > Caller Name ID > DisableDid this a long time ago. This bloat-ware caused many other issues that were resolved, but this one persists.
PrayerHa,
Thank you for your suggestions!

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Phone intermittently disconnects 4g without notice or warning. What's wrong?

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