Objective-c – MPMoviePlayerController play video second time

I need to have the possibility to play more than one video in an app.

Unfortunately, the second time I press play, video appears blinking.

I use only this code for playing vide

NSURL *url = [[[NSURL alloc]initFileURLWithPath:[[NSBundle mainBundle]pathForResource:@"Movie" ofType:@"m4v"]] autorelease];

MPMoviePlayerController *mp = [[MPMoviePlayerController alloc]initWithContentURL:url];

mp.movieControlMode = MPMovieControlModeDefault;

[mp play];

moviePlayer = mp;

[mp release];

Can anyone tell me where can be the problem?
Thanks in advance!

UPDATE 1: It seems that the Apple MoviePlayer example has the same problem.