Loud Engine Noise problems of the 2008 Toyota Camry Hybrid

I have really good driving record with no accident & not even 1 ticket in the past 20 years before these 2 accidents & we've had the car for 6. 5 years. 1st accident happened on 4/11/14 at 9:14am. Traffic was bad during the morning rush hour so all cars were travelling slowly. I was on fwy 5 heading s to the fwy 55 s ramp in CA. Matrix (1st car) suddenly stopped while all other cars were still moving forward. Equinox (2nd car) stopped & I immediately slammed my foot on the brake pedal. However, I didnât feel the car stopping at all & I thought I heard the engine roaring, but then thought it was only my illusion. Since the damage was only bumpers & headlights we just let insurance handled it & moved on with our life. However, I did start driving extra carefully after this incident. 2nd accident happened on 6/23/14 at 8:40am. Again, traffic was bad during morning rush hour. I was on jamboree in irvine, CA heading towards newport beach. I was waiting for the red light on jamboree at the 405 n bound exit intersection in the 2nd lane from left (total 4 lanes). There were already 2 accidents around there & light had just turned green. All cars were moving very slowly due to accidents nearby. Yukon had already pulled into the intersection & suddenly stopped. I was still behind the line with some distance & slammed on brake immediately but didn't feel the car stopping until hitting yukon. I heard brake sound and engine roaring again while my foot was on the brake pedal. This time the roaring sound was clear compare to April accident. It was at over-path of fwy 405 so the road was a bit going uphill. Hybrid does not start fast at all so I am sure my speed was very slow. Car is determined as totaled because engine went under yukon's spare tire hanging in the back. Toyota said hybrid has a black box that records data. Want to get access to the encrypted data if possible.