Aston Martin DBX Engine problems by year

lightly braking from about 35 mph on a slight downgrade. The transmission downshifted normally, but simultaneously the engine sound and RPM increased audibly, and it unexpectedly began producing substantial forward propulsion despite continued application of the brakes. Significant additional brake force was necessary to overcome the engine torque and prevent acceleration. It was quite noticeable not only to me but also to my passenger (my wife, a mechanical engineer). The condition persisted for at least 5 seconds before subsiding and allowing us to drive the final 2 miles to get home. No warning messages appeared on the dash. The first event was in April, on a highway at 65 mph and braking gently to move right into slower lane. My wife was onboard and took notice. This was not as obvious as the most recent event. The second event was in May or June, when I was driving alone, pulling forward into a parking space and slowing from no more than 10 mph. There have been no warning lamps, messages or other symptoms of the problem prior to any of these events. All events occurred in GT drive mode, with the engine fully warmed up, in fair weather. The vehicle has been at an authorized Aston Martin dealership since July 16, 2026. The dealer, assisted by Aston Martin Technical Assistance, conducted diagnostic testing and road tests but was unable to reproduce the reported condition or identify its cause. No repairs have been made.