We bought a new house in Georgia in 2007. About two years later we started having shingles just slide right off the roof. No wind at the time so we couldn't figure it out. The builder of our small subdivision had gone bankrupt so we had no recourse there. I had a roofer come and repair it. He said that whoever nailed the shingles down did a terrible job, leaving them loose and prone to do exactly what they were doing. He repaired them for us and went on his way. Over the next five years this happened three more times. It started getting expensive replacing/repairing the shingles. For a relatively new house, the roof looked terrible. The last time it happened was right before we put our home on the market to move where are now. I hired another roofer to come out to make sure the roof was in good enough shape for the inevitable inspection that would happen during a sale. He said he wasn't sure it would pass inspection because not only had it been installed in a sloppy manner, but the original shingles that were installed were substandard at the time of installation and that there was a class-action lawsuit against the manufacturer of the shingles so there would be no help from any warranty. Long story short, I had to replace the roof in order to sell the house. Good Luck.