I don't know if anyone else experienced this but I had QR just cancel/drop flights from my DONE4 and from my son's LONE4 repeatedly. When we were last in JNB the day before QR flight JNB-DOH-ORD, I happened to pull up our reservations on AA.com - sure enough, no QR flights. Called AA RTW and they confirmed that QR simply removed/canceled those segments of our ticket. AA tried to add them back, no J inventory... they had to contact QR directly and were able to convince them to give our J seats back despite no inventory. It took almost 90 minutes over the phone to get things fixed.

If we showed up, even 2-3 hours before, I'm guessing we'd have risked missing our flight. I don't have any more QR flights in my current DONE4 and so far, none in my next one... but I'd warn people to check back often if you have QR flights with AA ticketed XONEX.