iMessages and texts won't delete on iPhone 5s
i have an iPhone 5, that I updated to iOS 8.3. When I did that I could no longer delete any iMessages or text messages. If I told it to delete then the messages would lock up until I restarated the phone. Once I restarted it they would show back up. I downloaded iOS 8.4 hoping that would help and it has not. I have tried to do a reset but when I do nothing changes on the phone. Any help or suggestions would be appreciated, thank you
iPhone 5s, iOS 8.4