iOS: Keyboard freezes on device but works in simulator - ios

Question

Whenever I go to enter text in a subclassed UITextfield on the device, I'll get two or three characters entered and then the app freezes. Can't dismiss the keyboard or touch any tabs. Here's the UITextField subclass:
#implementation OAI_TextField
#synthesize elementID;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
colorManager = [[OAI_ColorManager alloc] init];
fileManager = [[OAI_FileManager alloc] init];
self.font = [UIFont fontWithName:#"Helvetica" size:20.0];
self.textColor = [colorManager setColor:66.0 :66.0 :66.0];
self.borderStyle = UITextBorderStyleRoundedRect;
self.backgroundColor = [UIColor whiteColor];
self.returnKeyType = UIReturnKeyDone;
self.delegate = self;
}
return self;
}
#pragma mark Text Field Delegate Methods
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[self resignFirstResponder];
//if project number text field we're going to check and see if the "Project" directory contains the file, if not we'll create it
//get super view
UIView* myParent = self.superview;
//get the subviews
NSArray* mySiblings = myParent.subviews;
//get the label
UILabel* myLabel = [mySiblings objectAtIndex:0];
//get the label text
NSString* myLabelText = myLabel.text;
//check it!
if ([myLabelText isEqualToString:#"Project Number:"]) {
NSString* projectNumberPlist = [NSString stringWithFormat:#"%#.plist", self.text];
NSString* projectNumberPlistPath = [NSString stringWithFormat:#"Projects/%#", projectNumberPlist];
[fileManager createFile:projectNumberPlist:projectNumberPlistPath];
}
return YES;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField {
NSLog(#"ok");
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
}
*/
#end
I'll get the NSLog call in - (void)textFieldDidBeginEditing:. I do not get any error messages in the console. Not really sure where to begin debugging this. Could someone give me a nudge?
Thanks