Daewoo Kalos my car turns itself off whilst i am driving

Hi guys,

I have a big problem with my Daewoo Kalos. The car turns itself off whilst I am driving along. This problem is happening at least once a week and sometimes twice a week. There is absolutely no pre-warning about this issue (no light is flashing on the dashboard). It happens suddenly within a second. It has happened on the motorway at 70 mph on B-roads at 30 mph or middle on a roundabout. It never has happened whilst waiting at a traffic light when the car was standing (it only happens when I am driving along).

When the issue happens, I wait about 1 minute and then I can restart the car without any issues (I cannot startup the car just after the failure (it won't startup)).

The car has already been 3 times into a Daewoo garage. The first time they did a Scan100 and they found a faulty battery. They replaced the battery but the failure was still happening. Then the car went into the same garage for a 2nd time and they did another scan100 and found nothing. However, this was back in the middle of February and the issue is still happening up to twice a week. Therefore I just have brought the car to another Daewoo garage and they also cannot find what's wrong with the car.

Has anyone any suggestions what to do? I am very worried driving this car as this is a major safety issue and could cause a big accident.

Thanks a lot.