Hiii to All Members I m Vishal

I have got Speedtouch 585 ADSL Modem.My office internet connection is distributed through this Modem.Also one Linksys WRT 54G Wirelee Router is connected to this Speedtouch 585.Now there are many times internet is disconnecting & after 1 hour or 1.30 hours it is automatically connecting.All LED status on Speedtouch 585 is as follows.
Ethernet-Green-Blinking
Wireless-Red-Blinking
Power-Green
DSL-Green-Staedy
Internet-LED not ON or sometimes RED
So Please help me out.I m suffering this problem since many days.I hope this forum will help me finding the exact problem..