Sorry to hear that you camera is acting up! What specifically happens after you click okay to restart the app? Do you get the same error? If so, can you try these steps and clear the app data/cache of the camera app?
I'm just checking in to see if you had the chance to try the steps Chris left. Can you reply back and give us an update on this? Thanks!
Welcome! Just wanted to touch base and see if the troubleshooting Chris offered had solved this for you! Please let us know how you're doing, we want to make sure you're able to take advantage of all your camera has to offer! I'm also sending you a PM shortly regarding your username, so when you have a moment, take a look at your inbox. Thank you!