So.. I have had this tc since 2014 and it has had quite a few transmission problems and I'm still trying to find the problem...

When I bought it, it drove great, same old story. Started making noise and took it to be replaced and it was the clutch and ISB.

Was ok for a bit but noticed day 1 that going 3-4 would slightly grind and was told it had to be clutch and would just wear in and go away.
NOPE.
About a year later it goes out again. Replaced whole transmission this time..
Car makes it about one more year with same issue with 4th gear and bearing noise.
It went out again and I almost junked the car till a relative sold me his wrecked 7.0 RS for parts. I change out the transmission AGAIN. got it back about 2 weeks ago and has already started doing the 4th gear grind and the ISB/TOB noise is back...
Could this be an issue with ANYTHING other than the usual?
I love the car so much but this is REALLY annoying at this point...