Retina Macbook Pro Having Trouble Connecting To Wifi?

Hi, I have a TP Link router with a 2013 2 TB time capusle connected to it.
And My macbook pro seems to be having trouble connecting to the TP Link's network, My 5GHz network on my time capusle, and my normal 2.4GHz network on my time capusle.
When I try connecting to a network it says connecting for about 30 seconds and then comes up with a exclamation mark "!" symbol.
It will randomly start connecting and working, then maybe 10,15 minutes later it drops out for a few hours again. Im not sure what's going on.
P.S Averything else will connect (Macbook air, iPhone 5s, My iMac, My iPad mini ect.
Please Help!
James.

When you see an exclamation point in the Wi-Fi menu, from the menu bar, select
 ▹ System Preferences... ▹ Network
Click the Assist me button and select Assistant. Follow the prompts. You may get a warning that Wi-Fi is not available, that you're too far from the base station, or that you're using the wrong password.
Assuming that you've ruled out those possibilities, restart the computer and try again. If there's no change, click the lock icon in the lower left corner of the preference pane and authenticate, if necessary. From the Location menu at the top of the window, select Edit Locations. A sheet will drop down. Click the plus-sign button to create a new location. Give it any name you want. In the new location, set up the Wi-Fi service with the same settings you used before. Click Apply and test.

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Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6
Netspot
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Mac OS X 10.6 Help: Solving problems with connecting to the Internet
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Retina Macbook Pro Having Trouble Connecting To Wifi?

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