The Status file is maintained by the batch job DSEXPSST (run with Dispatch up) or DSEXPURG (run with Dispatch down).
If you are not running one of the batch maintenance jobs, you need to have one setup and run on a regular basis.
If you are running one of the jobs and the file still filled up then validate the parm member for the job and check the values specified. For DSEXPURG the member name is DSPURG in CADSOPTN, for DSEXPSST the member name is DSPSST, also in CADSOPTN.
If you set the parm member to use from and to dates, you can set the TO date in the DSPURG/DSPSST control member to 12/31/59 which will cover you until 2060. This will prevent the status file from filling up again and the problem from re-occurring.