Error with :.! commands

Hello,
I see the following error when I try to in-line execute a shell
command something like

:.!grep foo bar

"/tmp/v454263/17" E212: Can't open file for writing
E482: Can't create file /tmp/v454263/17

It usually happens if the vim session has been on for a long time
without ever closing and reopening vim.
A fresh vim session does not give this error. Any idea what happens
here?

Thanks,
Chandra

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