title: S3 buckets randomly unmount on EC2 instance
body: <p>My company currently is using S3fs and Ec2 from AWS. We have been mounted our s3 buckets on our Ec2 instances, but after some time (a week, for example) some of the buckets unmount by themselves and our server instances become nearly useless. The error is "Transport endpoint not connected."</p>
  
  <p>S3fs version: 1.61 build from source</p>
  
  <p>FUSE version: 2.84.1 build from source</p>
  
  <p>OS: Linux, Ubuntu 11.04</p>
  
  <p>Is there some kind of safe mechanism for preventing (or at least detecting) these problems? </p>