Norval, this is normal on this model Taurus. Mine took a few openings/closings to wear in. I helped it along by cleaning and using some light dry lube at the cylinder/frame contact points. She is butter smooth now. Also check cylinder for "free spin" to make sure it is not binding. Most firearms will have a wear in period of some sort. If you don't notice improvement after this, then contact Taurus for resolution at Taurus Customer Care (800) 327-3776 Monday - Friday
8:00AM to 10:00PM (EST)

it should get better with use

Norval - most likely just needs a little break-in time, use, and cleaning/lubing. BTW Taurus DOES NOT ave a lifetime warranty any longer on weapons not in production before January 1, 2018. Their new warranty policy: "The Taurus Unlimited Lifetime Repair Policy extends to all Taurus USA firearm models in production prior to January 1, 2017.
This policy does not cover grips, sights, accessories, cosmetic defects after one year, or damage caused by customer abuse at any time. Taurus USA will not be responsible for these items." That means of course, they change one single little thing and designate a different model number for any/all their firearms, and instantly, no more lifetime warranty for those 'new model' firearms.

Norval, Inspect all mechanical parts of crane and release lever. Clean and lube lightly all mechanics of cylinder. Make sure cylinder release button is functioning properly. Check for wobble when you spin open cylinder. May have a QC issue. Good thing is Taurus has the lifetime warranty. Not functioning properly send her back.