title: Vim problem in macos, terminal turns blank randomly
body: <p>I'm using vim in iterm2 on macos. every few minutes, sometimes hours vim has turned to an (often almost) empty page when returning to that window. I've tried disabling plugins, without effect. I even tried using vim -u NONE and vim turned blank after a while again ... Any ideas? I've also tried nvim with same results ...</p>
  <p><a href="https://i.stack.imgur.com/1UQqm.png" rel="nofollow noreferrer">screenshot: this is how the empty vim terminal looks like</a></p>
  <p><a href="https://i.stack.imgur.com/jYrWi.jpg" rel="nofollow noreferrer">screenshot: what it should look like</a></p>