San Andreas crashes on iphone when i try to start 'sweet's girl' mission. Solution?

As the title says… Any help?

I have the same problem with an iPad it always lags, glitches, crashes instantly when I play a mission but this might help:
Close all apps (double tap home button then swipe up all apps if iOS 7) then switch it off completely or restarting (sleep button with volume button)
This generally works though temporary, and if it's still there all the time, just email rock star or something they might help