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Hi everyone, i have one iMac (21,5 inch 2011) and suddenly my wireless and ethernet card stop working and it only work again if i reboot the system.It can be fisical problem? can i fix if i change the wireless card and ethernet card?Here is the log system i catch when the error accoured:Mar 13 07:11:36 iMac-de-Raymundo System Information[9669]: BUG in libdispatch client: kevent[EVFILT_MACHPORT] monitored resource vanished before the source cancel handler was invokedMar 13 07:17:08 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.preference.network.remoteservice[9667]): Service exited due to signal: Killed: 9 sent by com.apple.preference.network.rem[9667]Mar 13 07:17:15 iMac-de-Raymundo Finder[465]: BUG in libdispatch client: kevent[EVFILT_MACHPORT] monitored resource vanished before the source cancel handler was invokedMar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.xpc.launchd.user.domain.501.100008.Aqua): Caller not allowed to perform action: loginwindow.110, action = service removal, code = 150: Operation not permitted while System Integrity Protection is engaged, uid = 0, euid = 501, gid = 20, egid = 20, asid = 100008Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.AirPlayUIAgent[563]): Service exited due to signal: Killed: 9 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.storeuid[915]): Service exited due to signal: Killed: 9 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.noticeboard.agent[566]): Service exited due to signal: Killed: 9 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.ViewBridgeAuxiliary[9666]): Service exited due to signal: Killed: 9 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.wifi.WiFiAgent[568]): Service exited due to signal: Killed: 9 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.imklaunchagent[552]): Service exited due to signal: Killed: 9 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.epson.scannermonitor.84420[4943]): Service exited due to signal: Terminated: 15 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.universalaccessd[456]): Service exited due to signal: Killed: 9 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.FolderActionsDispatcher[541]): Service exited due to signal: Killed: 9 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.security.keychain-circle-notification[725]): Service exited due to signal: Killed: 9 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.lateragent[685]): Service exited due to signal: Killed: 9 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.hiservices-xpcservice[585]): Service exited due to signal: Killed: 9 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.SystemUIServer.agent[4931]): Service exited due to signal: Killed: 9 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.epson.eventmanager.agent[4934]): Service exited due to signal: Terminated: 15 sent by loginwindow[110]Mar 13 07:17:15 iMac-de-Raymundo com.apple.xpc.launchd[1] (com.apple.Siri.agent[553]): Service exited with abnormal code: 1Mar 13 07:17:15 iMac-de-Raymundo loginwindow[110]: BUG in libdispatch client: kevent[EVFILT_MACHPORT] monitored resource vanished before the source cancel handler was invokedMar 13 07:17:15 iMac-de-Raymundo sessionlogoutd[9691]: DEAD_PROCESS: 110 console