Traction Control Light On problems of the 2005 Toyota Prius

Traction control light flashes and car accelerates when encountering sudden bumps in the road. This occurs when hitting bumps while the brakes are being applied. I have informed Toyota about this and they never replied. The affected car is a 2005 Toyota Prius with 65,000 miles. Purchased cpo in August of 2009 from a Toyota dealer. This issue is a repeat occurance. I have encountered this issue in excess of 20 times since I've assumed this car and noticed prior to the massive recall noise in the media. Thank you for your time.

When approaching a light, I changed lanes into the left turn lane, applied the brake to slow down, let up on the brake to go over a depressed area where a pipe was being replaced and the road repaired. I then applied the brakes firmly to stop the vehicle. Unfortunately, nothing happened. The traction control light went on when I went over the bump and it took about 2 seconds of heading towards the back of a truck for the breaks to engage at all. When they finally engaged, the car stopped very quickly (as I would expect) and I was almost rear ended by the person behind me. I have had the brakes not engage on one other incident that also involved switching lanes and a bump. Traction control and abs on this Prius need to be replaced with something that will not kill. I was very disappointed that the "braking problem" was "limited" to 2010 Priuses. It is not. This issue has clearly occurred twice for me in the past 5 years of moderate driving (about 10k miles per year). To address the issue, Toyota told me that I was making it up, it never happened, I must have not pressed the brake pedal. I never released my foot from the pedal and the car stopped just fine after a significant delay. They did not replace any parts or make any changes to the vehicle.