RequestError with aws-sdk-go for S3 upload

Question

When I try to upload mp3 files to S3 using the s3manager package of aws-sdk-go, I get this error.

2019/03/29 11:02:07 Error occurred while uploading 
/var/recordings/98a8d64ab5d01c9e00ba4ca1e292ce61.mp3 . Error : RequestError: send request failed
caused by: Put https://<bucketName>.s3.ap-southeast-1.amazonaws.com/98a8d64ab5d01c9e00ba4ca1e292ce61.mp3: EOF Current file size:  678071

The problem is, this happens only sometimes. I have added logs to check if the files are empty or not. Everything seems fine.

Here is the code that I am using to handle the upload:

Input

fileReader := bytes.NewReader(buffer)
input := &s3manager.UploadInput{
    Bucket:      aws.String(awsBucketName),
    Key:         aws.String(filename),
    ContentType: aws.String(fileType),
    ACL:         aws.String("public-read"),
    Body:        fileReader,
}

Upload function

func upload(svc s3iface.S3API, input *s3manager.UploadInput) (*s3manager.UploadOutput, error) {
    if input.Body == nil {
        return nil, fmt.Errorf("the body provided in input is nil")
    }

    uploader := s3manager.NewUploaderWithClient(svc, func(uploader *s3manager.Uploader) {
        uploader.PartSize = maxPartSize
        uploader.LeavePartsOnError = false
    })

    uploadOutput, err := uploader.Upload(input)
    if err != nil {
        return nil, err
    }
    return uploadOutput, nil
} 

I don't know how to debug this. I am pretty sure this is bug in the AWS sdk. I have created an issue here. Any insight on this is helpful.