My 2014 has always been notchy with 5th gear, now that it's cold out, it sometimes won't go into 5th with a bit of grinding. Now, I don't even use 5th unless the car is warmed up. My car has just over 5,000 miles currently.
After several issues with this clutch/transmission, I talked to an engineer at Ford, he said that in January or February, Ford will release a new additive or oil to help get rid of the shifting issues.
99 Chevrolet Camaro Z28 M6 - 6.676 @ 103 in 1/8, 10.512 @ 130.2 on street tires, H/C/I
93 Eagle Talon TSI AWD 5spd - Built 6 Bolt, 16G Evo3, HKS 272 Cams - under construction
94 Mustang GT - 5.0 bored and stroked to 347, Vortech V1 @ 10 PSI, Tremec TKO 600 - PIA