I was following it. My AI guy was responding to ATC. (I prefer to doing it myself but let the AI responses run for the short flight.) The first half of the trip, ATC gave instructions, the AI answered, and I adjusted the plane accordingly. About mid flight, the ATC went quiet but the AI kept responding as if “he” was hearing ATC. I kept adjusting altitude to match the AI response. All along, IFR/ILS automatically turned the plane along the preset path. About 30-40 miles out of the destination, the plane no longer followed the path and my AI co-pilot shut up. I took manual control and landed with no communication possible.