Transmission Failure problems of the 2006 Chevrolet HHR

I drove my vehicle to new jersey for vacation but came back to virginia within two days. Upon my arrival in virginia, I repacked my bags and headed to charlotte, nc. All the driving that I was doing was highway driving. To new jersey I drove I-81 north and I-78 east. To charlotte, nc I drove 220 south and I-85 south. After I got off on I-85 south to go back to the hotel on the way up the hill towards the hotel the car stopped moving forward. It would rev up when pushing on the accelerator but would not move forward. The car however would shift gears and go in reverse. I parked the car in a parking lot and had called my insurance company to have the car towed to the local Chevrolet dealership. The dealership determined that the transmission failed but could not give me a determination as to why it failed. Had the transmission failed as I was speeding down I-85 south there would have been a serious accident. Additionally, this morning (August 22nd , 2012) the car would not start. The lights inside the car would come on such as the gauge lights, radio, etc but the engine would not turn over. I had the car towed to the midpoint Chevrolet dealership and it was determined that the starter was bad and thus had to be replaced. Also, the morning of November 24th upon returning to my car from a night out the car would not start again. This time no lights would come on. The only indication that there was at least some power was the indicator light on my car charger. I contacted my insurance company and received a jump start from a local tow service and the vehicle has been running smoothly ever since. This has occurred twice in the last few months but there is no indication as to what may be draining the battery's power. I have had the battery checked twice and on these two occasions and is deemed to still be good.