SRM unique issue !

[Smokey Nagata]

2014 370Z and my Synchro Rev match feature is acting wonky with no warning or trouble light present. When downshifting to lower gears the Synchro Rev match will break up the car and bounce and buck about the rpms for about 1-2 seconds resulting in what almost feels like a mild misfire (while it decides on what it wants to do). I noticed it will also do this if I rev out 2/3rd gear without upshifting. The car will rev out fine until I let off the gas at high rpm and then the car will break up, and the rpms will take 1-2 sec to settle correctly ! If I turn the srm feature off the car has no issue and can row through the gears upshifting/downshifting without problem. I have attempted to reset the ecu multiple times and have checked the switches along the clutch pedal with no luck, the problem is almost intermediate as it first showed up for a short time 1 year ago and had disappeared until earlier this year when I turned the feature off for the first time in a long time. I daily drive the car and almost always have it on to make commuting easier.(My gear indicator also functions correctly). The problem almost feels like a nasty burble tune but its almost violent and unsettling for the car. I drained and refilled the trans with Motul Gear300 75w-90 grade about 20 months ago from today*

Has anyone ever seen this before on their car or have any idea what the culprit might be, I have researched on the forums and it doesn't seem to be a common issue at all as most people with SRM issues have the light illuminated and the feature does not function at all.