I can answer for me.
This all started after the update. I use the Samsung factory app and have disabled Verizon's messenger app altogether and it still responds and sends the texts to people that are not texting me at all.
My issue got the issue partially corrected. I contacted verizonwireless and they connected with Samsung. The auto reply issue is auto activated with new update. Samsung is working wit carriers and car manufacturers so issue can be resolved in the next update patch. But the speed and batter life issue was resolved over the phone by clearing out caches that might have still remained from previous versions. My speed is back to a phenomenal level and battery is incredibly working beyond expectations. As far as the auto reply. I'd have to wait.