This is a major bug as far as I'm concerned. I start writing a new comment and sometimes need info from another Android app on my phone so I switch to that app (email etc). I copy some text to the clipboard and then switch back to Trello. Now my comment is completely gone!! WTF?
When I tried this, the text DID disappear, but it came back as soon as I tapped "Add comment" again.
So the text isn't gone; the box to type it in just closed, and it can be reopened.
If the text is gone when you tap "Add comment", then maybe the app is closing in the background. I would suggest making sure whichever flavor of Android you're using isn't closing Trello in the background in order to conserve battery life if that's the case.
Let me know either way!
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