you are probably be getting duplicate text messages because someone else's phone is generating them. That is what my S5 is doing. It doesn't happen all the time but when I write a text message and send it, in the next message box either all or the very end of my last text message sent will duplicate. I have to go thru the trouble of deleting it before I can enter my new message! It is very very inconvenient. Help!
The OP said messages from many people, not just one with an issue like you have.
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