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IMO, it's most probably that there're unburned powder flakes or the like getting under the extractor star or into the case rim recesses and causing one or more of the case heads to 'drag' against the recoil shield.
.22 RF ammo is prone to incomplete combustion. The L/LR case was originally developed to allow for a larger volume of BP. Most all of the Smokeless propellant charges in modern RF ammo usually leave a good deal of empty space inside the case.
This allows the charge to 'spread out' along the bottom of the case which can result in less-than-ideal flame propagation and leave some of the powder grains unburned.
If you start to run into the same sort of problem when your revolver comes back from Taurus, just take a few Q-Tips along when you go plinking. When you start to feel resistance in the rotation, empty the cylinder and clean under the star and in the rim recesses. That'll most likely cure it, at least for another few cylinders full.
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