[falloutboy]

Things like these random malfunctions scream "ground-issues"
May your car see winter / salt / bad weather a lot?

Get yourself a Haynes or Chilton manual and see if you can single out a common ground for these issues.
Or maybe even a bad ignition switch, if it more often just cuts out while stopped.
See reasons why GM recalled our cars to put these non-sense plugs into the key