You know, I just had to finally hard reset and this fixed for me
it seemed to be triggered by actually txting messages, then my text would go black and look like i am typing blanks. and the phone is sloooooooooooow. And also still had the phone miss notifications such as txts.
I tried many times restoring certain things from back up but gave up on that, it was always revert back to crap.
So slowly I am installing things back onto the phone.