One of the ongoing problems that has affected some OS X users is random dropouts in their Wi-Fi connections. While Wi-Fi connectivity is not an issue with most Mac systems, for people experiencing it, once the problem starts it seems to persist. In some situations nearly identical systems on the same network will result in one system working fine and the other being regularly dropped.
Unfortunately Wi-Fi connectivity is difficult to troubleshoot, since there are many factors that play into a stable connection. These include drivers and other software configurations, the Wi-Fi card, the router, other computer hardware and components, … Read more