Within 10 minutes the same error reoccurs on N and the second event does not show. It must be that there is an inability for the driver to:
The \Device\NDMP49 service entered the Intel(R) Centrino(R) Advanced-N 6235 state.
So it seems to be something to do with the way the AP is interacting with the adaptor that stops the adapter entering the Intel state when using N. This is down to Intel as sometimes it works and other times it does not. Bad code period. The only remedy seems to be to turn off N.
C-