Arrow, tap, and lag issues

There still are serious problems with arrows and taps being dropped and game play lagging behind the music. I've stopped playing online for most songs because it is too frustrating but even playing offline I encounter the same problems. Yesterday I kept a list of the songs I played offline and if I had problems with them. Here's a list of the songs; contagious, two weeks, without you, troublemaker, all I wanna do, turn yourself around, light it up and losin it.

On every song there was dropped arrows, taps or a lag in game play that caused a streak to be lost. It happened in slow sections but was more pronounced in fast complicated sections, especially the lagging issue.

I am playing on an iPhone 3g with 3.0 with TTR2 2.6.