Every 4 minutes , without fail , there is a chirp from the clock , day and night. I have replaced batteries , this had no effect ..... Still chirps every 4 minutes. It does not matter if the alarm bell symbol/s are solid , flashing or removed.... It just starts to chirp and one alarm bell symbol flashes non stop. Just about ready to do a compression test with the nearest wall. Any idea what is causing it ? My email address styxwix@gmail.com