Thanks for jumping in Maverick. Consequently, after looking for software issues my router (as access point on LAN side) has died a few days later. I suspect this to be the culprit for my MD issue, but I had quite a few other devices on the netowrk exhibt bizarre behaviour. Including my two Cisco7970 (SCCP setup) which due to the TFTPD error I suspect where failing. They are on a seperate Cisco switch not connect physically to the WAP though. So I am at a loss as to what, other than the hardware failure caused the collapse. Having replaced the WAP the system has to returned to my previous normal.
For completeness I am running 14.04 from a netinstall close to a year old, but is up to date as of a week ago. I did check your post on sizelimit, this didn't see to have been my issue (at the time).