I can confirm this.  I've been using sshfs since around Breezy and am
how using Gutsy and Hardy, and in every version I've had this problem,
although I have the impression it's become more consistent since Gutsy.
Here are some observations I've made:

1. sshfs locks up consistently (no exceptions) whenever left idle for over 
maybe 20 or 30 minutes, regardless of what host I'm connected to and what kind 
of network connection I use (wireless, t1, cable).
2. Any program (terminal, nautilus, media player, etc.) that tries to access an 
sshfs file/directory locks up (sometimes uninterruptibly).
3. The only way to unlock these programs is to kill the ssh process (ssh -x -a 
-oClearAllForwardings=yes -2 remotehost.org -s sftp).  I used to lazy unmount 
("fusermount -uz mountpoint"), which frees up the mount point but leaves the 
ssh and other processes hanging.

I'll have to try to see if it still happens without network-manager--it
may be that I started having this problem when I started using NM.

I think this is a major problem that makes sshfs practically unusable
for anyone who doesn't like to constantly kill and restart processes
through the command line.

-- 
sshfs locks up randomly
https://bugs.launchpad.net/bugs/137514
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