Your trans should shift smooth thru all gears cold or at operating temps.
You should bring this to the dealers attention and have your concerns documented on a GM repair order.
Get a copy and keep for future reference.
You have plenty of warranty left and being a lease vehicle you are in a good position.
Your call if you want to drive it like it is for a while to see if it gets better.
2014 Equinox LTZ FWD 3.6L. V-6 (LFX)
GM6T70 Transmission-Gen II(M7W)
Crystal Red Tintcoat-Brownstone Leather-(FE2) Suspension-18" Wheels
Build Date: Nov. 04, 2013-Delivery Date: Nov. 25, 2013