Q: can I change for a new mac pro after I buy it one month?

I just bought my computer one moth later. And there is some problems with the wireless connection. Sometimes there is no reaction for the wireless connection(I click the network name then no response) when I open the display without shutdown. To solve that problem, I have to restart the computer. I have to use the computer right away, so I cannot just bring my computer to the apple store when the problem happened. I was mad at this and want to change a new one. Since I just bought it recently, can I change a new one with free??