Memory Leak on ListView (due to ByteArrayToImageConverter)

I m using ByteArrayToImageConverter to convert byte array i m getting from SQL server databse , the converter as below

 public class ByteArrayToImageConverter : IValueConverter
    {
        public ImageSource retSource;
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
           // ImageSource retSource = null;
            if (value != null)
            {
                byte[] imageAsBytes = (byte[])value;
                // byte[] decodedByteArray = System.Convert.FromBase64String(Encoding.UTF8.GetString(imageAsBytes, 0, imageAsBytes.Length));
                // var stream = new MemoryStream(decodedByteArray);
                retSource = ImageSource.FromStream(() => new MemoryStream(imageAsBytes));
            }
            return retSource;
        }


        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {

            //return null;
            throw new NotImplementedException();
        }

my problem when i show all the images in the xaml list view ( bind with my model) i m having memeory leaks , every time i open the list view the memory is growing gradually , Whast is the solution to reduce the memeor leaking issue with the converter and list view ( by the way i m using CachingStrategy="RecycleElement" but it dosent reduce the memory leak. please if anyone across this type of issue please let me know.

Thank you inadvance for your support.
Pan