播放视频几次后，ALMoviePlayerController UI卡住了

Question

使用ALMoviePlayerController播放4到5个视频后，应用卡住了一段时间。随着用户播放更多视频，视频加载时间也会增加。

以下是一段代码：

moviePlayer = [[ALMoviePlayerController alloc] initWithFrame:vwFrame];
moviePlayer.shouldAutoplay=NO;
moviePlayer.view.alpha = 1.f;
moviePlayer.delegate = self; //IMPORTANT!
player = moviePlayer;
isSourceYTPlayer = NO;
[currentControlller.playerView insertSubview:moviePlayer.view atIndex:0];