New TP link router settings

Hey, so I bought a new router a non BT one, plugged it in, changed its settings so it has the right pppoa things etc etc, now the inretnet is working i surf for maybe 2 minutes then the router loses its broadband connection then a minute later it gets it back and will then repeat the process, I got a new router due to my homehub being faulty now and again, but i plugged it in and thats working fine doesnt lose the broadband connection. So i assume its something in the router, its a TP-Link 150Mbps Wireless-N ADSL2+ Modem/Router (TD-W8951ND) [TD-W8951ND] router. I assume it's something with the settings, just weird how it works for 2 mins then loses the broadband connection. Here's some screenshots.
Can't post screenshots atm, need 5 posts