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Hello my name is***** am an ASE Master Technician and I am glad to help you with your question.
Most likely unrelated. EPC is a problem in the drive by wire system. Most likely a problem with the throttle body. You need to get all the codes scanned with a scan tool. Getting these codes is the first step to diagnosing this problem.
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When this happens, does it crank and not start or not turn over at all?
Do the interior lights and gauges still work when this happens?
I would look at replacing the starter for this problem. The starter may have a dead spot in the solenoid. That is why its does not happen all the time.
Could also be a park/neutral switch problem.
You may have 2 separate problems going on here. Take this to any auto parts store and ask for a scan. They will scan your engine for free.
Let me know what codes you have and we will go from there. I will leave this open and I will be on and off tomorrow throughout the day.
Ok that is fine. Your welcome.