Wireless TC failure on Mac Book Pro

Hi Guys, It seems that a few of you out there are having similar problems with TC over home networks. My problem started when I updated Leopard Yesterday (latest security update). I have my Mac Book Pro (core duo with the wireless n upgrade) connected to an Airport Extreme and Airport Express (as an extender) with a canon pinter and two Lacie 500Mb HD's connect to the Airport Extreme USB.
The network was working really well and has been fro over 6 weeks, all my i-tunes stream from the external drives etc. So yesterday TC suddenly stop backing up on wireless network, however if i connect my Mac Book Pro direct to the TC drive (one of the Lacie's is TC only) via USB, it backs up fine.
Seems really odd that until yesterday TC worked great over wireless, now nothing all I get is failed (the error says 'failed to mount drive'). The drives are visible and everything is working as far as I can see, I can even manually go in to the TC drive and open files wirelessly!
Any ideas???
Thank you for any advice.

KKong wrote:
The old cable was the one supplied by Lacie and the one now being used is a thicker cable (expensive). Don't care as it now works, so check the cables first guys!
Was the cable "Shielded"?=small foil in wire to shield from leakage/interference.
Always check your cables!!!
Cat 5=10
Cat 5E=10/100
Cat 6=10/100/100

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