My 2005 G35x has been shutting down unlike anything I've seen on this forum. The 1st time it was just a glitch while driving when the dashboard just went off and on within a second or so. The 2nd time was a couple of weeks later when the engine shut down while driving. No dashboard lights but horn, lights still working. The 3rd time was a week after when the car was parked. I opened the windows using the remote and a minute later got into the car and tried to start it. No clicking or anything just silence. The horn, lights and smart key work but not the radio, ventilation or dashboard lights. I can open the trunk with the remote but not from inside the car. I couldn't even close the windows. I kept trying to crank it but all I had was complete silence. I disconnected the battery and tried after reconnecting but no help. 30 minutes later the car just restarted like nothing has happened. The immobilizer light was on when the key **** was at acc and the key light was green. Thanks in advance for any help.