Imac keeps loosing WIFI connection

Hi all,
I loose wifi connection most of the time (but not all the time) at around 18:00 pm !?!, very strange !
I have no neighbors and no houses close enough to interfere with my wifi.
After loosing connection I do: Syst. Pref - Network - unblock modification with password - Help me - Diagnosis then choose my wifi
and it starts working again for 3 minutes.
Then I loose connection again and have to go through all the previous steps. After 4 or 5 times it's all ok.
What gives ? Can anyone help me please ? Any suggestions ?
I have to use wifi because my ethernet port and firewire ports both stopped working and Apple says I have to take the machine for repair.
Thanks for any help.
OSX 10.9.4

Please test after taking each of the following steps that you haven't already tried. Stop when the problem is resolved. Back up all data before making any changes.
Step 1
Take the applicable steps in this support article. The Wireless Diagnostics program generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
Step 2
Disconnect all USB 3 devices. If you don't know which are USB 3, disconnect all USB devices except keyboard and mouse.
Step 3
If you're not using a wireless keyboard or trackpad, disable Bluetooth by selecting Turn Bluetooth Off from the menu with the Bluetooth icon. If you don't have that menu, open the Bluetooth preference pane in System Preferences and check the box marked Show Bluetooth in menu bar. Test. If you find that Wi-Fi works better with Bluetooth disabled, you should use the 5 GHz Wi-Fi band. Your router may not support it; in that case, you need a new router.
Step 4
Open the Network pane in System Preferences and make a note of your settings in the Wi-Fi service. It may be helpful to take screenshots of the various tabs in the preference pane. If the preference pane is locked, unlock it by clicking the padlock icon and entering your administrator password. Delete Wi-Fi from the service list on the left by selecting it and clicking the minus-sign button at the bottom. Then recreate the service by clicking the plus-sign button and following the prompts.
Step 5
Reset the System Management Controller.
Step 6
Reset the PRAM.
Step 7
Launch the Keychain Access application. Search for and delete all AirPort network password items that refer to the network. Make a note of the password first.
Step 8
Make a "Genius" appointment at an Apple Store, or go to another authorized service center.

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