Transmission Stuck In Gear problems of the 2007 Acura MDX

Random nav reset followed by non-acceleration until rpms reach over 3000. This has happened multiple times since purchasing this vehicle in July 2012. Navigation/radio system resets. Soon followed by problem of non-acceleration. Following reset, stop at traffic light, stop sign, etc. Light turns green. Car feels as though it is stuck in 1st gear. Will not accelerate over 1000 rpms. Extremely slow movement thru intersection then car slams into gear and rpms top 3000. After rough shift car performance is mostly normal, sometimes hard shifting. Next red light repeat performance. If put into park and then back to drive transmission seems to "reset" and may or may not repeat above action. If car is turned off and left to sit for a short time it usually does not repeat but for how long is anyone's guess. Lately nav reset happens so often I lose count, I just wait for the car to shift into what feels like first gear. Dealership has not been able to recreate this issue. No computer codes show up in system. Multiple complaints to dealer but they claim to have no record and to have never heard of this problem.