Michelin City Grip 2 Tire Loses Air Unexpectedly After 6 Months

I installed a 120/70 X 14 Michelin City Grip 2 tire on my motorcycle six months ago, and now it deflates suddenly while riding, as if it has a puncture. Despite multiple visits to the dealer, they couldn’t identify the issue. The tire has no visible punctures, the rim is intact, and no leaks were found, yet I have to travel with a pump for safety.

Instead of addressing the issue or offering a proper solution, they suggested I purchase a new tire. This response from such a reputable brand is unacceptable. A new tire shouldn’t have unexplained issues so soon. I request Michelin to investigate and resolve this problem promptly.