Just sucks that if you buy a new $55-80k pickup you have to void your warranty or take your chances with it leaving you stranded. My uncle drives a 2015 f350 with the 6.7 for work, state vehicle so no mods at all. His emissions system clogged up and crapped out at 20k miles or so and the whole rig shut down, no limp mode or nothing just flat quit. Had it towed to the dealership and they replaced the entire emission system from the turbo to the tailpipe. It was under warranty but billed out at almost $5k.
Most likely way too much time running @ less than full operating temp. Maybe lots of idling time or maybe lots of low-speed use. During my last oil change I asked the service guy about DPF and how long they last as I'm closing in on 130K on mine. He said the only chronically problematic trucks were operated by state DOT and had tons of low-speed/low-temp time and lots of idle time.
