@MREaz,

Without more details as to what is happening and when it is difficult to know what is happening. Personally, when I am having issues with my Windows Internet, I will open the Command Prompt -> Type "ipconfig /release -> Wait -> Type ipconfig /renew

This tends to fix most issues when it comes to PC connections. Next, if you are still having difficulty connecting, I would recommend making sure that there are no reserved addresses set for the PCs, and maybe consider making one to test if it is an IP addressing issue in the network