Vanishing SMSs
 

Hi all
This is what just happened to me:
I receive a sms and see the notification of it with the first words of the sms. When I go to conversations the message is gone. So I close and open it again and all my today sms from this sender are gone. I restart the phone and get a new notification of an old sms from this morning. The other thing is that there is no more name for the sender, it is only the phone number.
I have a lot of sms with this contact (gf), is there any kind of limitation?
Thanks