Netgear Wireless ADSL2+ Modem Router Model DG834G Issues?

I've recently set up the above model of netgear router, put in all the correct settings etc., and it has worked ok, connected to the internet. However sometimes it drops connection. On 192.168.0.1 the Modem status is connected with my usual download/upload speed. The IP Adress, IP Subnet Mask, Gateway IP Adress and Domain Name Server have --- instead of what they'd usually have. In my connection status, Connection to server is Disconnect, with Negotiation saying LCP is allowed to come up (now it says Initialise LCP). Does anyone know why it does this and how to fix it?