A prime example today - log in and decide to look at my trips (which I see now the numerical number has been removed?) and I find a reservation that I cancelled some time ago showing up in that area. I keep my cancellation records and confirm that I cancelled it several weeks ago. I entered the reservation but it comes up as an error - I will have to call them to make sure. Simply an inconvenience.
Secondly, I just returned from a small trip and was provided some excellent service from a few employees and wanted to send in a compliment. Guess what - No can do - apparently "the server is being stubborn right now".