[Porchdog]

That sounds like a cell (or more than one cell) shorted out. Given the short life and assuming that the truck doesn't sit for extended periods, and that the battery has never been fully discharged. likely a defect from manufacturing. It happens.
My understanding is that batteries typically degrade due to plate distortion and sulfation. the electrolysis process of discharge and recharge never perfectly takes the plates back to their original structure. Those changes just get worse over time.

I am one of those guys who had a great experience with my first couple of Optima batteries. Of the next three, none made it two years and the last one the warranty experience was terrible.

Odyssey has been very good to me since - but they aren't cheap. The little Odyssey 925 in my 911 has been amazing. My Odyssey 3400 in my boat is just getting weak after 11 years.