Hi guys, First - I want to apologize if the theme is duplicating. Second - I request your help about the following problem. I have Galaxy Ace which upgrade itself to 2.3.3 (two week ago kies propose me to do firmware upgrade when connected to pc). After that I noticed when press power button it take about 2 sec for screen to turn on. The two buttons light on instantly but the screen is too slow. It is not a big problem but it is annoying when you want to see quickly what is the time. The slow response of pressing the power button also appears when I want to end the call. There is 2 sec before the call end and the screen turn on. The Baseband version is S5830XWKP6 \I'm from Bulgaria and I think this is the final version here\ Build Number: Gingerbread.XWKPL As I sad the phone is not rooted, it is upgraded with Samsung Kies. About 90Mb of phone memory is free and about 800 in SD so I didn't think it is because low memory. RAM memory also enough because I don't have any background running applications. Can somebody help me with some advice? Will factory reset have any effect? And if yes, will it delete my contact from the phone memory? \I can backup them with kies I know, that is why I am asking. Does it necessary\ And if there is no solution can somebody tell me how to rollback to 2.2 WITHOUT rooting the phone? Thank you in advance!