Groups/Contacts - Iphone/Wireless slow -

Hi, I have na Iphone 6 - iOS 9.02, and since i update it to 9.02 some problems havent not been fix:

1º- Contacts - Groups - i have two groups there (iCloud and Outlook) i select to use only iCloud,get back and when i enter again it had booth selected again, dont change to use only one.

2º - when i play a game or use some programe, the Iphone stay slow after some time, need to carry as well on the screen to drag the page to get up and down. only after disconnect and reconnect the iPhone is coming back to normal ...

3º the wireless is slow as well, the pages take a long time to open such some games, and is not my wireless because i test in my old iphone and is good...