3rd gear feels notchy as of late

[Rahul718]

Hello all,

I have a 2014 Nismo with 27k miles and 10k miles on the transmission. Nissan put a new transmission in the car last August under warranty. For about a month I noticed that 3rd gear has gotten increasingly notchy. Although it's never grinded, it would just feel different than the other gears.
Sometimes it goes into 3rd like butter, sometimes you can feel/hear 3rd engaging (metal on metal but again NO grinding) and sometimes it's a much more subdued notchiness that's felt going into 3rd.

I was on Redline MT85 fluid when this happened and this past weekend I switched over to OEM Nissan 75w-85 fluid. No difference.

This doesn't really happen when shifting into 3rd at higher RPM (4-5k and up) and I notice it more shifting around the 3k rpm range.

Just curious to hear everyone's thoughts and experiences on this.

Thanks