Imessage keeps deleting all my messages?

Okay this happened 2 times and the first time this happened was around 2 weeks ago but I just ignored it but just yesterday, IT CLEARED ALL MY MESSAGES AGAIN. I WENT FROM HAVING 342 unread MESSAGES TO ZERO. I'm very sad and disappointed because I had a lot of funny convos I want to re read for memories and now they are all gone. And yes, my settings are set to "keep messages forever" it's been that way ever since I had this iPhone 6s. But anyone know why this keeps happening? And any ways I can recover my messages?

Try resetting your network settings

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