The web viewver hanging on for a while

All works fine for a while, but suddenly the web viewer stop refreshing the change and when I reload it it just hangs on for a while and works again after 1 or 15 minutes.

The Android preview in the same time works fine (all the time).

Some with this problem ??

Yes, that happens to me too, and many times in the visualizer app for the same as on the web. It may be because they are upgrading or it is the servers. But that it does not throw you any error, it is normal that it happens, since they are constantly updating.