Rich B,
The short answer is yes. My 44 RII, with -7 blades (fitted as per the requirement around 5 years ago) have started to delaminate. To the extent they are U/S. I have to buy new ones. I am understandably not happy. It's flown on the east coast of Australia, Robbie are blaming the salt air.
I hope that helps.
Arrrj