MacBook Pro can't see MY wifi connection

Hi all, Ok this has been bugging me for some time now, I've had a Macbook for around a year now and have notice that with some wifi routers my macbook can't see them until I reboot the router I'm trying to find. This can be most annoying and is beginning to become a problem, my iphone and ipad can see the wifi router but my Macbook can't unless I reboot the router and then I mostly get a connection (although this is getting worse as i have to reboot the router more often) but if I leave the connection i.e turn off the MB or leave the house on returning I have to reboot the router to get connected again. I have made a few enquires in web search engines but haven't found anything of much help and the problem is still here. At first I thought it could be my router but this has happened on a few routers of friends that I have tried to connect to, although i can see lots of other connections so it shows that the MB can find routers but not all. Is anyone else having this problem or does anyone know a way to fix this?
Cheers

Hi guys,
I personally figured it out on why this problem occur, well let me just hit to the point.
What happens is that the router of the wifi channel is being changed automatically or someone might accidentally changed it. MBP can't detect wifi from certain wireless channel. So, we have to change the channel of the router wifi channel that may be detectable by your MBP.
THE SOLUTION -
1. Connect to the wifi from a active device to the router wifi that your MB can't detect or use Ethernet cable to get connected.
2.Once connected, access to the router wifi menu by entering the ip address on your net browser, eg:192.168.2.1
3.Then go to wifi setup or menu, and you may come across the wireless channel.
4.Switch the channel from any numeric to numeric that the router wifi can make your MB detect it.
eg: Wireless Channel - 6 (change it to -->) Wireless Channel - 11
5.Save the settings for the router wifi, exit, restart your MB and HAVE FUN!

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