I don't think I've ever had a car that would lock itself in the circumstances described, either immediately or after an extended period.
They commonly will relock themselves if they have been unlocked and no door has been opened for about 30 seconds. The least 4 cars I have bought (3 Hondas and a Mitsubishi) have done this. But if I have had the door open, closed it and left it they stay unlocked.
I had a minor problem with a CRV after having a towbar fitted. The fitters left the tailgate switch badly adjusted so it didn't make the circuit when the door was opened (I knew this because the light didn't come on). I discovered the problem when I had been out to the car to get something out of th boot and left the keys on the boot floor. I brought the stuff into the house and went back to get them to find them locked in. Is it possible that the i10 that is locking itself almost immediately has a faulty door switch?
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