The new-case wizard keeps a draft while you prepare a case. A draft is not yet an approved case.
Use the wizard's exit controls and read the confirmation before leaving. Allow any save to finish. When returning, verify the information present in the draft, particularly after a connection problem.
Use Cancel Draft in the wizard and review its confirmation. The Cases list also offers Delete Draft to authorized users; that action uses a permanent-deletion confirmation. Do not discard a draft that contains work you still need.
If approval times out or the browser closes, refresh Cases and search for the case number before approving again or starting another case.