Airport Extreme - possible DHCP issues on UTP ports?

I have a recent (late 2012) iMac which has been consistently connected to my Airport Extreme via UTP with no issues until recently. The Airport Extreme is connected to my single port Motorola 5101 Bigpond Cable Modem.
Connected to the Airport Extreme via UTP are the iMac and a Lacie 4TB NAS media server. There are generally multiple devices connected wirelessly (iPhone, iPad, PS3, XBox) again with no issue.
I have a PC connected to an Airport Express at the other end of the house (PC has no wireless card) and the Express and Extreme are bridged with a common SSID.
Saturday night the "house network" occasionally lost wireless (iPhone switching to 3G) but after resetting the Extreme and the iPhone this seemed to settle down and has been working fine since then (4 days prior to this post).
Later on the Saturday night my iMac lost internet connectivity and resetting the Airport Extreme and resetting the Motorola 5101 did not help. Eventually rebooted the iMac and the Extreme and the 5101 and eventually (after a few minutes) internet connectivity was restored. (Error was "no IP address" and Airport Utility could not see either the Extreme or Express). Connectivity was restored by first turning on WiFi on iMac which immediately got an iP (10.x.x.x) allocated and then after a few minutes the UTP link also came up and remained up when WiFi was turned off.
The iMac has since "lost internet connection" around 3 times in total and a similar process to the above has not always restored connectivity – i.e. doing all the above worked some of the times and did not work others.
When this problem is happening on the iMac UTP connection there are no issues with wireless devices getting an IP allocated.
I am now running the iMac on WiFi with the UTP cable removed. Today I will try a new UTP cable between the iMac and the Airport Extreme to see if there is perhaps some intermittent cable issue.
The Airport Extreme and Airport Express (both a few years old) are running 7.6.4 firmware. I had recently setup timed access for a few wireless devices and also trialled the "guest wireless account" but these were set up around 1 week prior to the recent issues occurring. I have now removed both of these so that the Apple network devices are back to the settings they had which worked fine for years (albeit with different firmware versions over this time).
My diagnosis is that it seems that there is a problem with IPs being allocated by DHCP to devices connected to UTP ports but not over wireless. The only thing that seems to contradict this is that the Lacie NAS drive which is UTP connected (to UTP port 3) seems to still work and be accessible without issue.
So am also wondering if there is some intermittent iMac issue with the UTP port or with the cable. Will change the cable today as mentioned above to confirm or otherwise.
Any advice on further diagnostic processes and/or thoughts on Airport Extreme issues (hardware or firmware) etc would be appreciated. A search of the forums did not show anything similar but my search was not super-extensive.
Thank you for any help anyone can provide.
Andrew

In the end after LOTS of troubleshooting and testing - and WAY too much frustration Apple - this issue has proved to simply be what I assume is a bug in the Automatic network location management under Mavericks and I had this issue to a lesser degree with 10.8.5.
I have now setup a "Home" new network location and my connection has been 150% stable ever since.
So nice to not need to reboot my Mac 7 times a day or more after several weeks of significant frustration.

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