In terms of whether this is a trend:
In '08-'09, Ray played 38+ minutes in 30 games (out of 79 played). Ray admitted that by the end of the year, he was fatigued and injured.
In '07-'08, Ray played 38+ minutes in 33 games (out of 73 games). Ray admitted that he had been playing in pain for the first half of the year.
I don't think anybody is calling for Doc's head, but come on: this is an ongoing issue. No matter what Ray's conditioning is, he's 34 years old.