If you have tried 3 different routers then I don't think it's an issue with the router. It sounds like an issue with the wireless device you are connecting to the router from. Also you need to take into consideration the distance and objects between the device you are trying to connect and the router.
I have solved the problem. It was the internal wireless card in the laptop that I was having issues with. I disabled the wireless adapter and installed a usb wireless adapter and have not heard of any problems since! Thanks for your input! I hope this helps someone else out in the future--