Why my WiFi signal keeps cutting off?

If you hold down an "option" key while you pull down the Wi-Fi/AirPort menu bar item, what value do you see for "RSSI"?

It might help to reset the connection settings on your Mac using these steps one at a time until the problem is resolved, recognizing that, depending on your problem, not all of these steps will make sense:

1) Use the AirPort/Wi-Fi menu bar item to turn AirPort/Wi-Fi off, then on again.

2) Try to select your Wi-Fi network from the AirPort/Wi-Fi menu.

3) In the Network panel of System Preferences delete the AirPort/Wi-Fi item from the left column, then add it back.

4) In the same panel as (3), define a new location and see if you can make that work.

5) In the same panel, select the AirPort/Wi-Fi connection item, click the "Advanced" button, select the "TCP/IP" tab, then click "Renew DHCP Lease". Note that the fix this step implements may be temporary.

6) In the folder /Library/Preferences ( _not_ <yourhomefolder>/Library/Preferences), move the folder SystemConfiguration onto the Desktop, then restart your computer. See if you can now make your AirPort connection work.

These steps may not help, but they'll only take a couple of minutes to try. Before you try these, if you have any special network settings on your Mac for things like DSL credentials, note all your network settings, because the latter steps will destroy them. If you got all the way to the last step, if things don't work any worse than before, you can trash the saved SystemConfiguration folder.

Those are perfectly adequate RSSI values. I get usable but slow performance from a connection with an RSSI value of -60. Did you try the steps Ilsted in the previous post?

You don't identify the brand of your Wi-Fi router, but if it's an Apple unit, you can use AirPort Utility to show the noise value that your Mac sees and a graph of the signal strength and noise that may show you whether there are any sharp dips or peaks on either of those.

You should also be able to see the noise value in the "System Information" display. Pull down the Apple menu and select "About This Mac". In the resulting window click on "More Info", then on "System Report". In the new window select "Wi-Fi" in in the Network section. On the right look for an entry for "Signal / Noise".

You might want to update the system details in your profile to reflect the fact that you're running OS X 10.7 and not OS X 10.5.8.

Are you checking the box to "remember this network" (or however it's worded)?

You should also be able to see the noise value in the "System Information" display. Pull down the Apple menu and select "About This Mac". In the resulting window click on "More Info", then on "System Report". In the new window select "Wi-Fi" in in the Network section. On the right look for an entry for "Signal / Noise".

frankie627 wrote:

instead of moving the SystemConfig folder to the desktop, I moved it to trash. Otherwise it will not make a new one after I restart, and I restart twice.

I've never seen OS X behave that way.