Can't find wireless at home after just one day

The first day back home, everything was fine, I can find the wireless name in the airport list and use it normally.
then I just folded the MBP as usual (I bought it last Fall, and use it normally)
the next morning I couldn't find the wireless at home but only could find the neighbors', even we both use TP-LINK router.
Till today it's more than 3 weeks that I couldn't do anything with my MBP.
I deleted all the old wireless record in the preference list and add my home wireless usr name and passwrd but nothing happened, still can't connect to it/
I can connect to internet normally at a coffee bar or starbucks.
all the other devices at home ,like my iphone and ipad , and my 27inch imac can connect to my home wireless normally, but sometimes the imac will lose the connection.
I read the discussion about the similar problem in this forum, but I decide to ask it again because the most strange part is , my MBP connected to it normally at the first day!!!!
I bought my MBP last year through online shop in CANADA. I don't think it will be a channel problem since I did can connect to it in the first day.
I didn't add any software for the airport or internet connection, either.
If somebody could have any idea that will be so helpful. Thank you.

Location services based on wi-fi is dependent on the Wi-Fi access point database having a known location. It is also not dependent on your own wireless AP, it uses all the APs it can see. It is possible your AP was never in the database, but a neighbor's was. If the neighbor's AP can't be seen or has been removed, you would lose "your" location information.
SkyHook wireless maintains a database that Apple used at one point (or still uses). You can try adding your AP (Time Capsule) to their database and see if that generates a location after a few days.  http://www.skyhookwireless.com/howitworks/submit_ap.php
My understanding is Apple is collecting locations based on iPhone/iPad location data tied with visible Wi-Fi APs, but I don't have any solid source. So, I don't know if they still uses SkyHook data. I submitted mine years ago and was "located" shortly thereafter.

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