Prince, running any P2P apps? If so, it could contribute. The nature of them is to make loads of connections which tends to tax the capability of comsumer-grade routers. Common symptoms are progressive slowdowns, losing the ability to open new connections, or lots of DNS resolution failures - all of which may be "fixed" temporarily by a reset of the router. Update to the latest firmware as sashime suggested, and if that doesn't help, try reducing the max connections in your P2P app(s).
If no P2p, nevermind.
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