After 2 months riding the Stratoliner started shaking up and down on the highways. After 12K kilometers, my front and rear Bridgestone OEM tires were finished even though both still had plenty of rubber. Somehow ´cupping´ or flat spots developed all around. The dealer blames Bridgestone, now my 2nd set is staring to show signs of the ups and downs, this new set only has 7K kilometers. Any others with the same problem?