First of all:
Second, when you have 3 post, then you can add pictures. That would really help us see what and where and how uniform the cracks are.
Are they cracks in the paint only or is the actually plastic is cracked?
Is your paint the original paint or was it custom painted since you bought it?
The first things I think of are hitting a high curb, low brush, or someone backing into it. It is had to imagine just regular driving, even on a rough road, would create something like this. Many of us have had our smarts going on 3 years and have not seen this yet.
Third: Suggetion box - Create a thread in the New Member section so the members can formally meet and greet you.
Let us know more and we will be glad to share our responses.