I have been having this trouble off and on, I will receive a text and it will not open unless I reboot, it is always a continued conversation where i have already opened other messages and replyed and then when I get a response it wont let me open it?

I can open any other message above it or below it?

I have not deleted any messages from day one, Is this something I need to do and maybe causing the problem?

How do I delete them in groups and not one at a time? Can I go back and delete to a certain date?

Thanks