Yes yes UP, training is key to understanding any aircraft including the FBW Airbus. Some of the relevant ideas and new FBW concepts are easy enough to digest, but beyond the FCOM, training, training and more training, yes?
You can't tell me - it's never happened to me. What the hell are you talking about?
Autoflight and the peculiarities that come with it. Ask anyone (not me) with sufficient time on the aircraft and they will tell you that there are moments when one is left scratching one's head (or other parts human) thinking what the hell is it doing now.
It's not at all a safety issue, just a peculiarity - which training can sort out. Trust the automatics, and to maintain good SA, going back to Reagan's adage on his presidential era's Soviet nuclear talks, "trust but verify"