So as the title says, upon bringing my players to a map I had made a few weeks ago and some interaction with the map, I the GM and two other players had our browsers crash (One had their computer crash) and then were denied access back into the session. As you can probably tell, I was rather peeved that right as the climactic battle over the city was about to take place, I was suddenly cut out of my campaign. The map was 300x300, default DnD square tiles, without many tokens (I mostly draw on the map with the shape tool) or any sort of graphics on it. When we attempted to rejoin, the loading screen would appear, but not fully load; the only thing it would show other than the Roll20 logo was the toolbar in the top left. Does this happen often? Or was this an uncommon occurrence? Thank you for your time.