It's not just S9 and S9+. It also affected the Note 8. Completely messed up my phone. Battery life completely drained in less than half a day with UI - which I see no value in whatsoever. Used to have great battery life! Used to love Samsung, had multiple notes and S7 too. Spent all of last night trying to diable the UI app and reload all my apps. What a mess! Going to Google as soon as I can.