Why did my LG G7 ThinQ stop sending texts longer than 100 characters?

About a week ago some of my texts stopped going through. I can receive messages fine and anything short will send. Once it gets above 100 characters, it just sits at pending and never sends. I have a working Wi-Fi connection, 3 bars and data roaming allowed. I tried resetting my network settings, force stopping the message app and clearing the cashe, and restarting my phone. Nothing has worked.

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