After driving for about 1.5 hrs @ 95-100MPH (mostly via cruise control, lightly decelerating/accelerating with it as well)... I had proceeded to decelerate from about 100MPH to ~95 or so. The MOMENT i dropped below 99 the car threw itself into 4th gear out of the blue and STAYED there and refused to let go. I slowed down a bit, and sped back up a bit (still under 100), to no avail - engine was still obviously in 4th as it was 5000RPM++.
The car has e-shift so I figured I would give that a go, I stuck it in M, hit down twice - got it to indicate 4th (which it was already in), hit UP, it indicated 5th - but STILL didn't shift. repeated this several times. same thing.
Went back into auto-drive.. sped back up to 100, wham - back into 5th.
Tap the brakes...... BAM. 4th. Disabled cruise control, blah blah blah - still same thing. Finally I ended up stopping, shutting off.. turning back on. All better. I'm assuming (hoping) this is some kind of over-zealous function from the computer.
Is the car deciding I would like some heavy duty engine braking, more performance by sticking in 4th when it can (and DUMPING gas like no tomorrow..), or is it something I should have looked into?
Thanks!