I've been having trouble with this car while driving on the hwy. Seems as if there is a kill switch shutting of the engine and when it does I have no problems restarting it. I had a diagnostic done and it coded for a bad catalytic convertor. I had that replaced and I'm still having the same issue. The car does not sputter when it happens but what I do notice is all the dash lights are lit i.e. seatbelt, doors open,etc. Any Suggestions would be appreciated