Vehicles self exploding went left alone

So I noticed this happening a lot during the beta. Any vehicle left alone for a while just blows up.

Would be nice if your delivering supplies to a base and need to help defend it that it doesn’t blow up while your busy helping your team. Or maybe you can leave your heli on the roof incase your squad gets overrun while holing a tower or apartment and next to dip out.

Just wondering what people’s thought are on this.