It is the BC75XLT from Uniden. Next time it happens, I will do double L/O. I had just doing it once,What scanner do you have? If it's a Uniden you should be able to lock it out permanently by double push the avoid L/O button.
Remember that you'll reset that lock out with the next scanner write if you haven't added the frequency to the lock out table in sentinel.
Most other scanners work the same way.