Every so often I've noticed that all saved text message threads completely delete themselves all at once. I was just wondering if anyone knows a way around this, or to at least allocate more memory for the purpose of saving text messages. I already increased the maximum messages per thread in the messaging options menu and set it to automatically delete old messages as new come in to save space, but this has had no effect on the (seemingly) random deletion off all my messages at once every couple weeks.

Any help would be appreciated.