Network issue between Macbook Pro and Windows

I have a Macbook Pro 2012 model running 10.8.5. Also have a Win7 PC.
When both are connected to the home router via wire (or the Windows on wireless), everything is fine from network connectivity point of view. However if I move the Mac to Wireless (either 2.4 or 5GHz), Mac can't ping/reach out the Win7 computer and vice versa. Win7 can be wired or wireless, does not matter.
I checked not only ping, but http, https, vnc protocols. None of them works when Mac is on WiFi.
I also have printer, smartphones/tablets connected to the local lan and all are accessible either from the Mac or the Windows (including the home router and internet behind it).
First I thought it should be a Windows problem, so tried to shut the firewall down on that side, but did not behaved differently. Firewall is down on the Mac all the time. And firewall was somehow ticked out with the wired test when the Mac received pings from the Windows computer.
The other reason why I thought about Windows, when I boot it up, I can ping it for a couple of minutes. Then ping breaks.
Due to the 100% success of the cable test, now I started wondering if the Mac has some misconfiguration. Any suggestion I should check?

One more comment. Wired connection seem to be stable neither. I have ping running to the Windows computer and after a couple of minutes, it gets broken.
However if I have both WiFi and cable connection to the home router and disconnect from cable (after ping is broken), I get the network to the Windows comptuer back. Nothing serious on the network change, I just get 192.168.1.x instead of 192.168.1.y as IP).
During this network switch I do nothing with the Windows computer.
This is not valid if I want to connect to the Windows computer via Microsoft sharing (smb://192.168.1.x), then it immediately breaks the connection. Can't get it back until Windows is restarted.
Getting lost...

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