I lose my Bash history quite often recently. No idea what's happening.
  The file is either empty or truncated. As I don't  observe  any  other
  data loss, I can only assume that this is a problem specific to Bash.

  It's  annoying because I make intensive use of the Bash history. This,
  however, is a bad habit. I should not rely on something as volatile as
  the  shell's history. I should create more shell aliases or functions.
  It's even worse, some complex commands only exist in my Bash  history.
  I should document those things.