Rare in my case, too. In the last 3 years, which is when I've traveled the most, CO, Marriott, Hilton and Delta have been fine. I think I may have missed one flight or one stay somewhere, but after one e-mail it got posted. AA missed one round trip. I sent an e-mail 3 times with no response other than the automated. Nothing. I know I could have pursued it, but I don't use AA that much, anyway.