Worse quality over the years?

I used to get 5 year out a pair of jeans no problem, now my last 4 pairs last a max of a year usually blowing the crotch out in about 8 months. Im 6'1 fairly fit at 240lbs - I wash in cold water with supper up buttoned up, and hang dry. I wash maybe after 3-5 session or a need arises (really sweaty day from the humid heat). Winter I can sometimes stretch to 7 sessions and maybe wash 1-2 times a month...

So its not like ive changed anything as this has been my routine with jeans for the last 12 years.

Why is only the last 2-3 years ive had so many issues and they just dont last? Im down to my last pair of "older" jeans thats around 7 years old.