For a flight in June, when I printed out my boarding pass I noticed it did not have TSA PreCheck. I then went to my DL profile and saw that my KTN (Nexus) had disappeared. I then called the Gold line and the CSR unchecked me in, added my KTN to the reservation and told me to sign out, sign back in and check in again and print/reprint the boarding pass. That worked and TSA PreCheck printed on the boarding pass. Funny thing is, my wife was on the same flight and her KTN (Nexus) was still in her profile and her boarding pass had printed TSA PreCheck. This random deletion of the KTN from the profile is ridiculous!