5DEA- Clutch gearbox ECU: Reduction torque intervention because of rub in transfer ge

[fmugur]

Although I covered this issue on a different thread I thought the error message in the title might attract more attention.

So, my 4.8is has a noise when accelerating after driving for about 20 minutes. I also feel quite a loss of power as well when the noise happens. The noise goes away after a while but it keeps coming back. It sound like a gear slipping or jerking noise under the car. I cannot tell if it's the transfer case or transmission but it's somewhere in there. This is more when in traffic jam or going up a hill. I have not transmission errors on GT1 and INPA but the DSC throws:

5DEA- Clutch gearbox ECU: Reduction torque intervention because of rub in transfer gearbox.

I feel sometimes that the transmission is generating the noise but I am not sure.
The transfer case oil is new and TC reset and as well as the tranny oil filter with six liters of new oil.

Any tips on narrowing it down?