That's interesting. Could you take a screenshot of it next time it happens? Also, can you please follow Steps 1-3 of our Solving Technical Issues checklist to see if one of those components is causing the problem? We can only help if we can recreate your issue, so it is important that you follow each step. If doing that fixes the issue, just let us know. Otherwise, move on to Step 4 , and we'll need all that information to further assist you.