We had our concrete driveway replaced last year as the original had not been done properly and it ended up settling (as did the connecting walkway) to about 5 inches below the garage floor. The new driveway is less than one year old and while cleaning it, I noticed it has hairline cracks in it already. Is this normal? We live in an area where we DO get very cold some winters, and this past winter was one of them. Would this be the cause? Is there anything we (or the contractor) could/should do? Thanks!