Unknown address "message not found" and stalled messaging on samsung S6 active
I've received texts from an unknown address and when I open it it says message not found. I tried to see who it was from by signing into my wireless account and it shows the message was received but doesn't show a phone number or anything to indicate who it is from.
In addition, my phone has been stalling or lagging when I try to type a text and another text is coming through. This never used to be a problem but it is very frustrating because I will be typing and it takes quite a few seconds before the letters will actually appear. It didn't used to do this and started after one of the stupid software updates that are forced to my phone. How do I fix this?