Mbp can't see my airport !

I've been using my mbp with AExtreme n for 6 months without any problems. Since 2 weeks, sometimes when I boot my mbp, it can't see the airport. I haven't changed or moved anything ! Strangely, my mbp can see other wifi networks and my colleagues have no problem seeing my airport. I have to reboot my computer at least 5 times so that it sees the airport again.
Any ideas why ?

Try the following:
1. Delete Preferred Network(s)
- System Preferences > Network > AirPort > Configure
- In the "By default, join:" pull-down menu, select "Preferred networks"
- Delete the network(s) you regularly use from the list
2. Delete AirPort Keychain Entries
- Launch the "Keychain Access" application located in Applications/Utilties.
- Click on the "Kind" filter at the top, and look for any "AirPort network password" entries...and delete them.
- Restart, or log out then back in.
3. Add Preferred Network(s)
- System Preferences > Network > AirPort > Configure
- In the "By default, join:" pull-down menu, select "Preferred networks"
- Add the preferred network(s) using the "+" button.
- Restart or log out then back in.

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