DSL disconnect on waking up the mac

Hi all, this is a very annoying problem that's been plaguing me for a couple of months.
My setup is thus:
Internet -> speedtouch DSL modem -> D-link wifi router -> various computers including my mac.
Upon putting my mac to sleep overnight, everything is working nicely. The problem is when I wake it, it seems to disconnect my dsl modem, and the router doesn't seem to notice this, requiring me to disconnect and reconnect manually. Is there a cure for this?
Thanks!

Thanks for the replies.
Yep, it's the newest firmware on the router.
William - I would normally agree, except the last time I slept the mac, before waking it, I watched the modem to see if the lights would change, and sure enough, exactly the same time as when I woke the mac, the 4 green lights on the modem changed to 1 red and 3 off, as if it had been rebooted. The usual sequence of the lights turning on then went ahead until all 4 were green (sometimes it's 3 green, 1 red, the 'internet' light).
At this point, the mac doesn't accept the connection. I need to log into the router and disconnect/reconnect it.
Could the mac be sending out some kind of signal to cause the modem to reset or something?

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