WRT160N Mac adress update - How do I prevent it?

Hi.
I've just got a new Fibre Optics connection. But I've been having some problems lately. At least once a day, the connection from my ISP to the Fibre Box is lost. I talked to Support at my ISP, and they said that some of my equipment is causing this. He could see that my router is sending a new MAC adress to the fibre box, and that makes the box lock for 2 hours (because it thinks it's a new device being connected)..
Now how do I prevent my WRT160N from updating the MAC adress, or whatever it's doing. So I can stop these problems, not being able to go online.

The router should not be sending a new MAC address. The most likely way this is happening is if you have a switch between the fiber box and the router, and something else is plugged into that switch.
The MAC address on the router is a fixed address that is permanently programmed into the network interface on the router, UNLESS you have activated MAC Address Cloning on the router, in which case you tell the router which MAC address to advertise out of it's WAN interface. Even if that is the case, the MAC address should stay the same..it shouldn't change.
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WRT160N Mac adress update - How do I prevent it?

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