iOS 7.1 BLE peripherial advertisment issue - ios7

Question

I wrote an application with is advertising and scanning in the same time. It is working well, but I have an issue. After some time mz peripherial stop advertising.
I tried to restart but my phone and application it still not working.
Here is the peripheral implementation:
#implementation PeripheralManager
+ (PeripheralManager*)sharedInstance
{
static PeripheralManager *_sharedInstance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_sharedInstance = [[PeripheralManager alloc] init];
});
return _sharedInstance;
}
-(id)initWithUUID:(NSString *)UUID{
self = [super init];
if(self) {
self.UUID = UUID;
self.peripheralManager = [[CBPeripheralManager alloc] initWithDelegate:self queue:nil];
}
return self;
}
- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral {
if (peripheral.state != CBPeripheralManagerStatePoweredOn) {
return;
}
if (peripheral.state == CBPeripheralManagerStatePoweredOn) {
self.transferCharacteristic = [[CBMutableCharacteristic alloc] initWithType:[CBUUID UUIDWithString:TRANSFER_CHARACTERISTIC_UUID] properties:CBCharacteristicPropertyWrite value:nil permissions:CBAttributePermissionsWriteable];
CBMutableService *transferService = [[CBMutableService alloc] initWithType:[CBUUID UUIDWithString:self.UUID] primary:YES];
transferService.characteristics = #[_transferCharacteristic];
[_peripheralManager addService:transferService];
}
}
-(void)startAdvertisment{
[_peripheralManager startAdvertising:#{ CBAdvertisementDataServiceUUIDsKey : #[[CBUUID UUIDWithString:self.UUID]], CBAdvertisementDataLocalNameKey: PERIPHERAL_NAME}];
}