Wireless network keep disappearing?

I have two wireless networks at home. I have a problem with only one of the devices. It's a Benq Joybook R46. That Laptop keeps losing wireless connection and even not seeing any of them. The other devices are working great. I have another laptop and an iphone. I wonder where the problem is.
Any help would be greatly appreciated.

I assume that if you walk up to your router with this Joybook the connection is still so-so. It could be that the internal antenna has become disconnected. If you are handy with tools you can download the repair manual for that exact model. It will show you how to open the case and where the antenna is and where it connects.

Try to re install your wireless driver also make sure that the wireless network connection is enabled, if all the above didn't work then maybe you have a hardware issue.

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