Chasing Sunset - yes, many times. They really need to fix it, as it means you are not on any of the upgrade lists, can't check on-line, etc.

It happened to me for several times in one period. I e-mailed both the cocares people and then spent about 1 hour on the phone with various elite reps over a long period of time, and though we never discovered exactly what the problem was, it has not happened since.

Still - they need to fix this, it is awful.