it's probably designed to stay on a while and cool the engine. I would want confirmation on that though.
Burned out sending unit
clutch gone try putting into gear then start engine be ready to shut engine off
why do my head lights stay on when shut off after 20 minuets still on
that means your battery will be dead in the morning
If you have the 2004 model of the RX8 this could be due to the starter motor, Mazda themselves have noticed this problem and have created an upgraded starter motor on the RX8 but this dose come at a cost, Hope this helps
Check your battery
I do not have a answer for it, do you an answer for this problem?
you let it sit until it dies and then charge it then turn it on poof its done
Car just shut off checked getting fuel cranks good just wont turn over
Take it out of reverse.
battery may be dying and altenater may be going out
Defective ignition switch.