Transmission Question

[gx470forme]

Ok, have 300 miles on the new GX now and have a question on the transmission operation.

When I stop accelelarating and let my foot off the gas the RPM drops to idle for a second, then jumps back up to the proper RPM for whatever gear you are in for that speed. The odd thing is it doesn't do it everytime, just about half the time. The rest of the time the RPM just drops to where it should be for the current gear and speed.

I don't remember my 03' doing this, is this part of a new software interface, or do I have a potential issue?

Thanks