Phone shuts off at 15 to 20% battery

I own the ZTE Blade X Max from Cricket. Recently I've had some issues with the battery life. Having any form of internet on drains a full charge in 3-4 hours, even when not in use. The battery life is great when WiFi or mobile data are switched off. Also, the phone will occasionally suddenly switch from anywhere from 15 to 20% straight to 0 and shut off automatically. When I plug the charger in after this, it instantly says the battery is at whatever percentage it shut off at. Anyone have any idea what I should do? I have already done a hard reset and it didn't help.

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