2001 X5 After trans flush has shudder symptoms and torque converter not locking up

[vtyagi]

There really is no good answer that I can find about this issue:

1) I changed my Trans oil (purchase the new oil from the BMW dealer based on VIN#)
2) Followed the correct procedure of draining, warming up the engine, revving up the RPM with AC running, filling the trans fluid

Symptoms:

1) No issues when the vehicle has not warmed up.
2) No issues during hard acceleration
3) No OBD Codes
4) RPMs are bouncing up and down about +-50 RPM at any speed
5) Random and intermittent slight shudder which goes away if I accelerate of decelerate

Potential Diagnosis:

1) Could be not enough Transmission Oil? (Added more oil which did not help)
2) Torque converter lock-up solenoid is not locking up because the viscosity of the new fluid is different than the old fluid?
3) Transmission torque/pressure sensor?

Solution:

1) No one has figure it out on the forums. Seems like people are stabbing in the dark with random guesstimates.

Anyone have any suggestions?

Thanks,
Vic