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I’m using split panes in tmux – one being vim, the other being a shell.  Sometimes, around once a day, vim freezes.  I can move between panes, perform any tmux commands, just vim doesn’t react to anything.  This happens only with tmux.  My only solution for now is to kill that pane and create a new one.

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    This has never happened to me, and I have used tmux+Vim in that way extensively. This does not mean it cannot happen to you — but it means you will have to try to more precisely locate when it happens to try to figure out why. Relevant information is what terminal you are using. One idea: you are not just accidentally hitting Ctrl+S in the Vim window? In that case: press Ctrl+Q to "unfreeze". – Daniel Andersson Feb 17 '13 at 12:07
  • Just to clarify, I use Ubuntu 12.10, tmux, zsh and gnome terminal emulator. My tmux prefix is rebound to ctrl+s. If I hit prefix + ctrl+s, vim freezes. ctrl+q without prefix unfreezes it. It puzzles me why this doesn't happen in shell though. – Ondrej Slinták Feb 17 '13 at 12:33
  • The same thing seems to happen to me when I save and press ^ z to put vim into the background too quickly afterwards. – svenper Jun 8 '17 at 14:56
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You might have hit Ctrl+S, which turns off flow control in terminals and stops the terminal from accepting input. It is reenabled by pressing Ctrl+Q.

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    When you're just starting to use vim/terminal editors as your main editor, this is a very common problem. Later on, you'll end up having :wq spread throughout all your documents (or ZZ, I don't judge) and feel silly. – Rob Jul 29 '13 at 15:14
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    Amazing how you correctly guessed the problem from such such a vague description. Thanks! – DBedrenko May 30 '14 at 8:00
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    Holy ...! I've been having this issue for years, and never actually searched for a solution. This answer was the first solution I found, and it literally took me 3 seconds... All those hours wasted, and you had the solution just a couple of seconds away. I wish I could upvote you more (and downvote myself). Thanks! – simendsjo Oct 10 '14 at 21:29
  • Another time you might have this issue is when you're switching between editors (emacs and vim, for instance). They have different "save" commands, muscle memory confuses and hence the freezing. – Utkarsh Sinha Nov 11 '14 at 14:26
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    and if it happens to be twice unlucky (a remote tmux session with C-q as prefix): Type Cltr-q, then :, and enter in tmux: send-keys C-q! – Paschalis Apr 14 '16 at 20:24
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For me, this turned out to be a gpm problem. Run:

sudo service gym restart

See here for the related bug.

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