Anyone having issues with 2015 Macbook 12" keyboard? "N" key in thsi case

I bought in July the new Macbook 12" and I'm starting to regret.

It seems that this scissor system it's not really realiable as presented.

This morning all of a sudden I've discovered that the "N" key is not responsive as it was yesterday as are the other keys.

The feedback when you press it is not the same as with the rest. Also you need to push it harder in order to work.

What should I do ? What do you recommned? Of course it's under warranty, but I would not want to stay for a few weeks without laptop before they replace it.

Thanks a lot for your time and help!