It's interesting because I had similar experiences with 1st year Mt Hood. I had one bine get up to around 3 feet a few weeks ago and then just for no obvious reason, that bine wilted and died. The rest of the plant appears fine and intact. Very finicky compared to other hop plants I have. I have 1 of each....Chinook with huge leaves 5 feet. Hallertau approx 8 ft. Centennial 2 ft, Kent Goldings 2 ft. Cascade 11 ft, Northern Brewer 6 ft. and my struggling Mt Hood which is around 20 inches now. All have the same soil/manure/ratio/composition. So who knows.
"Look, let me explain something to you. I'm not Mr. Lebowski. You're Mr. Lebowski. I'm the Dude. So that's what you call me. That or His Dudeness... Duder... or El Duderino, if, you know, you're not into the whole brevity thing." -The Dude