Have you tried restarting the phone (turning it off and back on)? Also, did you have any updates or newly installed apps just prior to this? If so I would look at uninstalling the update/app, then restart the phone and see if this resolves it.
NOTE: I am referring to ones used by the phone itself, not in a specific app. If you are referring to this happening in a specific app only, then you would have to contact that apps creators.