Your ipconfig /all shows that you are using a dynamic connection; so no problem with that.
Have you tried your PC on somebody else's connection?
The intermittent nature of this implies to me a cable problem or loose connection problem. Make sure the cable connects very securely to your computer and what I assume is an ethernet jack in the wall. I mostly suspect that whatever the problem is it lies outside your control, but am trying to think of other things you can try.
Does a LED light when you plug the cable into your PC? If not, does it light those few times that you get a connection?
Have you tried your PC on somebody else's connection?
The intermittent nature of this implies to me a cable problem or loose connection problem. Make sure the cable connects very securely to your computer and what I assume is an ethernet jack in the wall. I mostly suspect that whatever the problem is it lies outside your control, but am trying to think of other things you can try.
Does a LED light when you plug the cable into your PC? If not, does it light those few times that you get a connection?