Dlink router troubles

Having some troubles with a wireless router/modem.

Dlink DSL G604T, about 10 months old.

It will randomly drop internet connection + network for every computer on the wireless (still works wired). After it happens, network searching will intermittently show no signal and full signal - attempts to connect produce vista error "no response from router"

Rebooting the router always solves the problem.

Seems to happen about once a day, at random hours, usually nothing significant running on the network. Unlikely to be interference of any kind due to the hours it seems to cut out.

Rebooting the router isn't too practical, nor is wiring it for everyone in the house, due to the router being in one of my flatmates bedrooms, and if they're asleep, we can't get to it. Wires would just need to be too long.

Any ideas what could solve it?