Welcome to the site..
Sounds as if a module may not be going to sleep. Had a similar issue with my wife's brand new KiA. About 4-5 days of inactivity it would go dead or partially, either way a no start condition. Per KIA engineering, they tried a higher cranking amp battery, a shim in the Positive cycle clamp per KIA and a flash/reprogram as a first/second attempt, and it continue to not only not start at home, but stranded her at the airport, sometimes late at night in areas 'of concern' which the Manufaturer not being able to correct the issue,, left them wide open to the liabilities involved as I stated very boldly. Looking on the net yielded more than just a few owners with the same problem, again,, pointed out..
Of course they said she left something ON etc. to shuck the blame, but after about 6-8 times of stranding her, along with the net proof of failures in hand, I took it to the dealer and said, 'It stays here for at least the period of time to get it to fail ( no one is to touch it to duplicate the fail times) or longer if need be,, and I will not put her at further risk. Again,, pointing out the Liabilty due to KIA should anything happen. They had the car for a few weeks and it failed, as well as during the repair attempts and the final check, it turned out to be a module/ sleep draw on the battery. Was an intermittently at times, not always a 4-5 day history, but given the possibilities of what could happen, just saying 'it can't be duplicated' is not enough.. It may/may not be the same issue, but the end results need to be the same.. if it can't be fixed, it needs to be replaced...
Last edited by Hayapower; 04-15-2017 at 10:16 AM.