Nokia Lumia :: Managed To Delete Almost All Texts Overnight?

my phone has managed to delete almost all my texts overnight. The only texts that survived are the ones i don't need, like the useless one you get from Microsoft at the start, and all the useless operator ones.

what the **bleep** happened, and do i have to expect this for the rest of its life,(which wont be long). i have just transfered my texts from my n8 but not of all of the contacts had old messages, and some old operator messages still survived. this is not what i expect from a phone, for it to randomly delete all my texts.