Problems with 2008 Hyundai Tiburon TIRES

On 5/19/13 i purchased 4 new good year assurance fuel max tires. after driving less than 5,000 miles on the tires my tire pressure light came on 3 times, &when i checked them, all 4 had gone low (by 5-7lbs of pressure each time) . after the 3rd time of this happening, in less than 6 months of purchase, i decided to search online to see if anyone else was having similar problems with these ties. the results were scary; i found dozens and dozens of blogs & reviews stating these tires were slowly loosing air, bubbling &/or bursting. most stated cracks were found on the sidewall inside the tire, causing pressure to go low. after seeing these results, i went outside and inspected my tires more closely, and the front driver side had a small bubble in it. i immediately took it back to good year and was told that the bubble was a road hazard issue cause by hitting a pot hole (and this was before anyone even took the tire off to inspect it). i asked why all 4 tires have been slowly loosing air, and their reply was "that is odd, that doesn't usually happen like that." based on my findings from the internet, i asked them to inspect the internal sidewalls of the tires, just to make sure there were no cracks that could be causing the slow air leaks. i opened a file with gy's customer service and they asked the store to inspect the inside of all 4 tires, and to send them an inspection report, but all the tech did was spray the outside of the tire to check for air bubbles/leaks (but did not remove the tires to check the inside walls). the tire with the bubble was replaced, but i was not allowed to keep the tire to have it inspected. i was told the manufacturer would inspect it, but that will take several weeks. i'm very concerned with the number of reviews/blogs online with the same/similar complaints about these tires, so i am filing this complaint to document my experience with them. i've had my car since 2008 and never had any problems with my old tires. *tr