Plz help! 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 schity 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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