Hello. Thank you for coming to JustAnswer.
Sorry for the wait. My name is Michael. I will be helping you with your question today.
Bart, you may only need to do a complete restart to get the phone back to normal. To do that, press the power button until you see a screen to shutdown or restart. You can do either one - restart or shut down. If you shut down, press the power button long enough for it to virbrate to turn it back on. Wait a minute or two for it to come up and then check to see if it behaves normally. If not, let me know - there are some other things we can try, like doing a reset of the phone. It isn't likely to be a hardwarte failure, if that makes yo feel any better.... we can get it corrected.