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Do you have a remote starter?I've heard of some people with remote starters having strange issues with their Edge turning on or off.
I read about another guy whos Edge wouldn't shut off with the ignition.This didn't fix the problem but it is how he dealt with it.
The only way to shut it off is to put the key back in the ignition and turn it to the "on" position (not start) and then back to "off" and take out the key.