If the data limit option is not selected and your Data usage settings look correct then proceed with the next step in troubleshooting.
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In that case, we recommend you reset the app to see if it works things out.
If it takes you too long, you can always buy one from other Tamers.
There is a feature in your Galaxy Note 4 called Auto Network Switch that will automatically connect your device from weak mobile data to Wi-Fi to preserve a stable data connection.
Pay attention — we might both learn something.