Sounds like Acetaldehyde and Lacto to me. Let's face it, no matter how diligent we are with our sanitation, sooner or later it happens to all of us. In 16 years I've had 3 batches go sour. All 3 soured batches happened using plastic buckets and 6 years ago I switched to all stainless steel. So I probably had micro scratches in my plastic. Or, maybe I just had a micro lapse in my sanition, like forgetting to resanitize a spoon or something? But it's not a question of if but when. Some folks are quite happy to chalk it up as a sour. Not Me! My last soured batch about 6 years ago was a Aventinus clone that made me want to puke. I was gonna toss the whole batch. Decided first to take a few bottles to my LHBS to get some advise on what went wrong. They pleaded with me to not dump it and let it sit a few more months as it would be, to them, a wonderful sour in the making....
. I gave it to them with my blessings! What to them was a great sour was to me a foul tasting total waste of time money and effort. So to each his own. Let someone else , who you know is not sour beers , taste it . They might love it. Personally I would chalk it up to an enevitable 1st incident of lost cause batch. It happens. My 2 cents.