Car Will Not Start problems of the 2000 Suzuki Grand Vitara

The vehicle has an intermittent electical problem. On a random basis it wont start. We have taken it to the dealer and it started for the. We towed it to the dealer and they had it for a week and they said they could not find anything wrong with it. There was another vehicle the same as ours at the same time with the same problem. It happens quite often, sometimes it will start after a few hours sometimes it won't start for a couple of days. We were planning a trip but have had to cancel it because the car is not dependable. I have gone out to go to work and the car will not start. I am the cartaker for my parents and I can not depend on the car to start if I need to take them to the doctor or anything else that a person needs a car for. I do believe something can be done. I do not feel that I must have the car towed in another four or five times before something can be done about this car. It will be snowing in a few months and I surley do not want to get stuck someplace in the snow. This is a serious problem and I do not like that the dealer nor the manufacture will not do simething about this problem until it happens in their presence. They have agreed that the car has a problem but they do not know what the problem is.