While traveling on the freeway today at 80 MPH @ 2400 RPM. I noticed that if I took my foot of the gas pedal that the tach would go to 3000 RPM. It feels as though the torque converter is unlocking while coasting at that speed. After allowing the car to slow to 75 from 80, I lightly placed my foot back on that accelerator and cruised back up to 80. It took at least 15-20 seconds for the torque converter to lock back up again. Anyone else notice this?