It hasnt gone away so i started a little research last night. Ps3 has a long run of cat 5 from the router for obvious reasons.

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Ps3 ethernet cable not connected. Well theendless that is not always the case with ps3s after your ps3 had picked up the wireless router you might need to enter a wpa key or a wep key enter your wpawep key. Try these troubleshooting steps. Select yes when a confirmation screen is displayed stating that you will be disconnected from the internet. Select settings network settings. Find the right network. It seems it is not an uncommon phenomenon but because everyone starts their own threads about it they are getting the generic guess answer ie you need a new router or cat 5 cable.
I then googled and read that it could be downloading programs causing me to disconnect or that i fried my ethernet port on my ps3. Select internet connection settings. A with the help of cisco connect software if at all you have installed the router with the help of this software. Connect an ethernet cable to the ps3 system. Recently i started getting the odd random ethernet cable is not connected error coinciding with getting kicked out of an online game or losing my place in a show or movie. I dont think its any of this because my ethernet cable works sometimes without disconnecting and sometimes it doesnt so its weird for me to find.
Well if you can try to replace the ethernet cable with the new one. If wi fi is disabled and youre still not getting a network connection make sure that ethernet is enabled in the same network and internet settings section. An ethernet cable is not connected eventually popped out again.