Help plz! Not getting 4g anymore

Tried getting help. I recently tried a fresh install of cm13. When it booted up it searched for a network. Went to network settings and let it look for a network. Found sprint and said it was trying to connect or register. Now I'm only getting ****ty 3g data sometime. No 4g. Almost seems like its not using the sim card. Tried booting up without it and it was still working?

Edit: using the g900p for sprint

Someone please help. All is appreciated

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