Hi there, I'm Tim and will be assisting you today. I have over 15 Years as an Engineer and have been with eBay, DoD and many others. I will do my very best to help you. If you like i can offer a phone call or remote session to make things quicker and easier.
well, buying a new router will prob gain zero....
Can i offer a 5.00 call which as cheap as i can do them, and i will explain this mess to you.
There are a few things that could be causing this, and its probably not specifically the router.
Try changing the channels on the wifi router to 11, its probably on 1. Things like wireless phones etc can cause interference.