ACR WDB TRACK HDG DEV AFTER XING HAWAII ADIZ CAUSES LTSS WITH EBOUND TFC.

Narrative

PRIOR TO REACHING DUFFE INTXN ON R576 I HAD TO LEAVE THE COCKPIT FOR PHYSIOLOGICAL NEEDS. AT THIS TIME I INFORMED THE FO THAT 'YOU HAVE CTL F THE ACFT. I HAVE TO USE THE RESTROOM.' UPON REENTERING THE COCKPIT I NOTICED THAT WE HAD DSNDED FROM FL310 TO FL300 AND WAS INFORMED THAT WE HAD BEEN GIVEN A NEW CLRNC BY ATC TO PROCEED PRESENT POS DIRECT BAMBO INTXN AND TO FL300. A FEW MINS LATER THE FO INFORMED ME THAT HE HAD BEEN TRYING TO CALL HONOLULU RADIO UNSUCCESSFULLY PRIOR TO DENNS AND THEN AFTER XING DENNS INTXN THE ACFT EVIDENTLY STARTED A SHALLOW L TURN AND THAT HE HAD NOT NOTICED THIS. HE THEN RECEIVED A CLL FROM HONOLULU RADIO TO CALL HONOLULU CTR. ONCE CONTACT WAS ESTABLISHED WITH CTR HE WAS ADVISED THAT HE WAS 25 MI S OF DENNS INTXN (HE SHOULD HAVE TURNED TO THE W). AT THIS TIME CTR ISSUED THE NEW CLRNC. A FEW MINS LATER CTR CALLED AND REQUESTED THAT WE CONTACT THEM BY TELEPHONE AFTER WE LANDED. I CALLED AS REQUESTED AND WAS ADVISED BY PHONE THAT THE ACFT HAD DRIFTED APPROX 25 MI S OF DENNS INTXN AND THAT THEY HAD TO ISSUE A NEW CLRNC TO AVOID A POSSIBLE CONFLICT WITH ANOTHER ACFT PROCEEDING TO EBBER INTXN. I WAS INFORMED THAT WE HAD CROSSED OVER DENNS INTXN AND AFTER THIS IS WHEN THE PROBLEM OF HDG S BEGAN.