I have one of those pillows and it does go flat mine did. Not sure about warranty either went into a my pillow store in crossroads Minnesota, and the gal there didnt even want honor the warranty.
She said call the factory not right maybe she had a bad day but i did not get any results there. Still have the pillow.
I think if you have the warranty and it being 10 years it should be golden. Would i try another pillow yes i want to see if mine was defective and how a pillow would be but afraid to buy one if they do not honor the warranty.
Product or Service Mentioned: Mypillow Pillow.
Reason of review: Warranty issue.
Monetary Loss: $49.
Preferred solution: Let the company propose a solution.
I didn't like: Quality.