Rebooted - Wait and See
Just picked up my XLR from dealership - The mechanic called Cadillac tech support
and they had no ideal how to fix trunk problem, since it started working again there was nothing to diagnose. The computer logged the fact the the trunk previously failed, but nobody had an ideal of what to do. The mechanic and I decided to reboot and see if that fixed the problem, since no one else is reporting this malfunction. We also decided that if this happens again, more drastic action needs to be done.
To clarify the problem, it has happened twice with the top up and once when the top was down (the top would not go up because the opening of the trunk is the first action). I don't think that the top mechanism is at fault, the probem is only with the trunk.
Thanks to all the replies, hope no one else has this problem.