What does the message "Transmission Service Urgent" indicate?

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The first message was "Gear Selector Service Required." Then I got the message "Transmission Service Urgent" and the "Check Engine" light went on. Then the gear stuck in neutral and I couldn't remove the key. The dealer did what they said was normal transmission service for 105,000 miles and replaced part #s 30759659-3,30735596-6 and 30667211-4 and the car was fine until I went on a long trip. It is fine on short trips - on long trips, while I am cruising at highway speeds, the "Transmission Service Urgent" message goes on and, sometimes, the check engine light. The next time I start the car, the check engine light has remained but not the message - it only comes on on long drives and, when it is on, the car seems sluggish at low speeds.