Switch to 5GHz
A problem you may not have previously considered is the frequency your router operates on. If you simply pulled it out of the box, installed it and never looked back, you probably grazed over the dropdown box that let you choose between 2.4GHz and 5GHz.
If you have a ton of electronics in your home, the 2.4GHz spectrum can get pretty crowded. A former colleague at Pocketnow, Joe Levi, explains that Bluetooth devices, wireless peripherals and even some microwaves cause a lot of noise in the 2.4GHz spectrum.