Car Will Not Start Problems of Infiniti G37

I brought in my 2012 for maintenance at an Infiniti service dealer. I received a "new" battery as I was told the battery needed replacement soon. Come to find out, the "new" battery was actually a faulty component and my car would not start. I brought it in for diagnostics and they said nothing was wrong. I told them that it must be the battery since I never had that issue before. The battery issue continued and I would have to jump my car off. The day I had to bring it back to Infiniti, I had to jump off the car and right after I did, the airbag light began flashing and codes indicated a faulty diagnosis sensor unit for the airbag. They then did their diagnostics again and determined that the battery itself was the problem in the car-starting issue, yet the Infiniti bag light continued to blink. The dealer said the cost would be $1600 to replace the sensor/control unit. The airbag has never been deployed and I never had issues until the battery replacement with a faulty battery and thus creating the need to jump start the vehicle. The light came on right after a jump start. I never saw the light before that.

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1. I was driving my 2009 Infiniti G37xs on I-95 near philadelphia. I was using cruise control with speed set at near 65mph. I was listening to pandora internet radio on my htc evo 4g android phone using wimax (4g wireless). The htc evo was being charged using a cellet pmotq9c car charger for cell phones. 2. Out of blue, all electrical and electronic system went black. All dashboard display(lcd), entertainmen/navigation system and ac and left/right turn signal and lighting all went out. Nothing electronic works including turn signal/emergency light. I was quite nervous, but didn't want to stop at middle of interstate freeway and drive straight home and prayed that power train stay working till I got home. Thank god, it did. As soon as I stopped the car by pressing the start/stop button after I drove into my garage, I waited a minute or two and tried to start my car by pressing the start/stop button while pressing the break pedal. The car would not start. I thought that my wireless card key had bad battery. So I spent 15min or so to find my 2nd wireless card key and strangely enough I was able to start the car. However, the "service engine soon" light on dashboard went on. I called the dealer service and wanted to bring the car. But dealer didn't have any loan car available till next Tuesday. So I waited and drove carefully with my car and brought it to dealer on the following Tuesday. Again strangely, just one day earlier, the "service engine" light disappeared. I trusted dealer had right equipment to diagnose. 3. Dealer took a few days looked at it and could only told me some limited diagnostic info about loss of comm and could not pin point the root cause of problem. I expressed my safety concerns on at night driving on I-95 situation when this happens again. The dealer assured me that all tests were done and no problem was found and the car was safe to drive. 4. I don't feel comfortable and feel that maybe NHTSA can better investigate this.

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