Questions 09 x5 4.8 please read

[x5 4.8i]

i have a 09 x5 xdrive 4.8 fully loaded im going to take the car in because of these problems. Car was built in Jan or Feb 09

1.my brakes screech a lot when i stop (can someone explain why they do)

2.the car jerks forward when im waiting at a red light then accelerate(i heard this was something about the transmission? i read in a forum to give the dealer this code SIB 24 01 09 for a trans update)

3. My driver seat moves around when i take corners

4.I get about 230 mpg is that normal?

5.My i-drive lags a lot especially the back up camera, is there an update for me?

I read in a forum that the trans update will improve mpg is that true?
And does anyone else go through these problems?
If anyone can answer all these questions that be great
THANKS