Thank you guys for your prompt response!!!
I have found as Master Browser issue very well known in the comunity
http://scottiestech.info/2009/02/14/how-to-determine-the-master-browser-in-a-windows-workgroup/
I truly believe that might be the issue, I will try that and let you know the outcome.
What I can see is that the recommendation is to put the router as a Master Browser instead of any computer(no matter it is a MAC nor Windows right?)
I´ll keep you posted !!
Thank you !!!
