Hendrick Kia of Cary

I purchased my car here in 2016. All was good until I had a issue with the car. When I press the fob to open the doors the mirrors pop out but the doors don't open. The issue happen sporadically. Some days it works and some days it does not work. I had it in for service 3 times and they can't seem to find out the issue. They told me they the only way they can find out what it is, is to bring the car in when it's happening. I have taken my car there 2 times when it was happening and both times I was told they are to busy to look in to it I should come back next week if it happens again. They told me it's not a safety issue. I am thinking how do you know if you don't know what the issue is. I will never buy a KIA and again nor will I buy any car from Hendricks dealers.