Flipping from 4G to 3G

Haven't seen 4g in a few days. Really afraid to take it in. I don't want another refurbished phone, and don't want to transfer all my stuff over again.
 
It is bad now. I have restarted my phone several times. Sometimes it picks up a 4G signal for a minute then goes to 3G and won't budge. I'm inside a strong 4G area, with several phones around me who are on 4G right now without issues.
 
My 4G drops whenever I have my Hotspot on for more than 10 mins. I'm using foxfi full version.

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It is bad now. I have restarted my phone several times. Sometimes it picks up a 4G signal for a minute then goes to 3G and won't budge. I'm inside a strong 4G area, with several phones around me who are on 4G right now without issues.

Some here, and my wife's S3 is so much stronger now. It makes me scratch my head.

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