If the router stopped working within warranty, the retailer may direct you to the manufacturer -- but your contract is with the retailer. On consumer durables you are probably entitled to expect around 5 years reliable service (in many jurisdictions)
We've had a Netgear DG series router running continuously at home for over 4 years without issues. I installed a secondhand reflashed ex-ISP model of that type at least 2 years ago with a voluntary organisation and that's also performed faultlessly.
The only serious problem I'm aware of is overheating and the instructions suggesting vertical positioning should be heeded.
Netgear's support has a mixed reputation but there's a good user forum.