I know Mickey personally. Let me tell you exactly what happened. See that one guy (I can't tell you his name,don't want to get him in trouble you know!!) woke up really cranky that morning, and decided once he got to work he would go on the computer and delete all your ADRs. Yes, only yours. Probably because you've been to WDW eight times and spent thousands of dollars.
To make it worse, he even hacked the website so that YOU, and only YOU, would get the "please call disney dining" message when you tried to pull in your ADRs. After that, to make sure he totally ruined your ninth trip by making you carry a piece of paper in the parks (what a hassle!!), he even blocked the lines when you tried to call and confirm your reservations.
So while some may think that the system upgrade failed, and that everyone is in the same boat as you, and that it's the reason why you were on hold forever on the phone, I can confirm you, that is not true. You were targeted personally. Mickey said.