OK. I changed the status from Resolved to Re-opened. Unfortunately, as I understand the situation, there is little that the Admins can do about the problem. But at least it should put an end to posts that are primarily made to say that the matter is not really Resolved.
The following may only apply if you happen to be running Firefox. But if you are, there seem to be three different clues (but only one of them applies to any given occurrence. The following three indicators should indicate that you have encountered the server problem:
A small solid black rectangle going 'round and 'round in the upper left corner of the screen.
Hard to describe video activity that repetitively sweeps across the top of the screen from left to right in the vicinity of the Home tab on the main tool bar.
And most frequently here, video activity that looks like narrow vertical rectangles over and below the Search tab on the main tool bar that also seems to sweep from left to right.
If the screen seems to freeze or the "do it" button doesn't appear to "do it" and you don't see any screen activity as described above, you are probably having some other type of problem.