Airport in macbook pro doesn't auto-find signals quickly and also drops sig

So recently, my macbook pro, which I use on campus, has been acting up when it comes to the airport. If I close the screen and open it up when I want to use the laptop, the airport won't find WIFI signals even though the computer itself has not moved. I have to use the "assist me" in network preferences or turn off the airport and turn it back on before it will find a signal. And then, if that's not enough of a hassle, it will randomly cut off from the WIFI signals I have and I have to go back and reconnect manually. If anyone can help me with this, I'd really appreciate it. The macbook pro is only a year and a half old, it should not be acting up for the price I paid for this thing and the hype everyone gives them.

System Preferences>Network>Show:Airport>Airport. Select 'By default select preferred networks'. Put the network name in the box and click Apply.

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