Mine did something similar. I received the update shortly after Thanksgiving... seemed ok at first and a few things were glitchy... my hotmail email icon kept being replaced with the stock SMS icon... very annoying... had to do a full reset... corrected the issue.
Then I started seeing noticable power drain issues... a few days ago, I took it off the charger and went to work. At night, its usually pretty low on power so I put it on the charger and leave it until morning... anyway, I got to work and heard it give the "Bleep Bleep" low power warning... Strange. I borrowed a co-worker's GS3 charger and left it alone for several hours... came back and it was only at 17%... odd... I powered it down and resumed charging. A few hours later, I checked it again... 21%... I powered it up and within about 2 minutes, I watched it drop charge to 9%, then the screen flickered and it died. I plugged it in and powered it up again... showed power at 3%... went home and did a full reset... charged it overnight... 17% again... went to work, limped it through the day. Brought to Sprint Corporate Store and service tech looked it over, found nothing wrong... battery was good and charging port was too... he replaced the battery with a new one and cleaned the charging port anyway. He also tried another reset... seemed ok and charged up fully, but burned through the battery quickly. Next morning, back to the same problems... by the end of the day, it refused to charge or power up for more than a few seconds even plugged in.... brought it back to Sprint and received a brand new phone... (they had run out of reman'd ones..go figure). New phone, keep getting update notification, but I'm gonna hold off until January.