WiFi keeps cutting out

I have a brand new 13" Air (haswell).

Today is day 5.

Wifi connection keeps cutting out.

I researched the fourum and found some old threads about this and did troubleshooting.

I did delete all the network prefs etc, I did downgrade the MTU in network pref to 1453 from 1500.

It does not drop wifi as often but still does.

Any ideas?

BTW: I use an apple airport extreme with latest firmware update and have sever MBPs on the same network without dropping wifi like this new Air.