Hi Fraser,
The devices connected to port 1 & 3 are nothing in port 1 and port 3 is I think the xbox360 or PS3 I tend to swap the cable over depending on which console I decide to play. I'm not 100% sure what you mean, do I need to disable the Random MAC address option on the router or on the actual device(s) itself?. I'm just confused because it has been fine since when I installed the firmware months ago, it's only the past few days this has started.
I asked other people in the household and apparently the disconnects are only happening to me, I already have DCHP at 10000 and reserved my IP.