MacBook ISP, Internet, server fail

My macbook pro has been having difficulties with wifi for some time now. When connected on wifi I frequently get the red ISP, Internet, and Server fails. I've noticed this only happens from my room and if I get closer to the router it's fine. But I used to be able to use it far from my router before, and my iPhone and iPad connect flawlessly where ever I am. On the odd chance that I do have a connection the speeds are usually pretty slow. Could this be a problem with my mac?