Got a bit of a strange problem.

We have 2 tivo's, both connected to the home network via wired ethernet.

one of the Tivo's every few days falls off the network, i've changed the cables, changed the port it's plugged in to on the router.

Typically by restarting the router it re-appears on the network, I've been looking at blaming the router so today when it had gone again from the network, I logged in to the router in admin mode, I noticed when looking at the DHCP lease page the both the tivo's were listed, but one of them had an expired lease

So what do I blame here, the router for not dishing out a new lease or the tivo?

It's kind of strange, but the other tivo has absolutely no problem in obtaining a new lease.