Sorry for the delay in your question Joe, I did not see either of your requested errors in the log.
I also haven't seen any improvement in the performance of the card (still unable to get a 5GHz connection) and I've again lost my Bluetooth connections.
Surely this has something to do with Windows 8.1 as this seems to be the common thread. I've just given up this weekend and bought another product that should be here tomorrow.
Sorry and thanks for the attempt.
K