Aspire V-571 Network adapter

Hi guys,

I've been experiencing a problem here. When I'm wirely connected (RJ-45), the connection stops and I have to run the Windows 10 diagnosis for my Ethernet. At the end of it, the problem is fixed and it presents a result: 

The default gateway is not available error

I've tried everything I was told to - but nothing helped.

Please, somebody!

Thanks a million!