Reset camera and target

Occasionally the view camera and its target become way off as picture shown below.
What is the method to reset it other than create a new file?


Hello- it may mean that there is some geometry that has been moveed or created in outer space. If you Zoom Extents, is there any change, for better or worse? If not, can you please post the file or send to to my attention, with a link back here to this topic in your comments?