This morning I started my 04 Monte as I got ready for work. Once I got into the car and shifted into reverse, NOTHING. Shifted into drive, NOTHING. Even the low gears did nothing. Shut off the car, and restarted. Then issue was magically gone. What was happening there? All fluids fine. Trans flush about a year and a half ago. Seeing as it worked fine after a restart, would it be due to a electronic problem? No check engine light on neither during issue or after. Please help!