Servers can crash due to bugs or technical errors it seems. I will tell you a couple of examples, especially the one your referring to. On April 14, 15, 26 in 2017 Antica got reset a total of 3x for the month of April! According to the official forums there's a reply on April 18th 2017 stating every time a player got into a battle the server would crash apparently. People claim it's due to the attacking and the server not handling the war. Here's the official reply:
> I want to point out that every time that there is a battle in Antica the server crashes.
+
> Are we going to have a reset every time that there is a battle?
Thanks for bringing it up. We adjusted the configuration of Antica to prevent further crashes from happening. Rest assured, we are already looking into this issue.
Source: https://www.tibia.com/forum/?action=thread&postid=37876710#post37876710
I also found some threads on Antica forums talking about the server crashes, there's more but these are the most popular it seems:
- https://www.tibia.com/forum/?action=thread&threadid=4543040
- https://www.tibia.com/forum/?action=thread&threadid=4542883
- https://www.tibia.com/forum/?action=thread&threadid=4543146
Here's the news on Tibia during this time which didn't reference anything regarding the server crashing bug:
Source April 14 2017- https://www.tibia.com/news/?subtopic=newsarchive&id=4034
We had to reset the game world Antica to the state of April 13, 10:00 CEST, due to a technical problem. We would like to offer our sincere apologies for any inconvenience this has caused.
Source April 15 2017- https://www.tibia.com/news/?subtopic=newsarchive&id=4035
We had to reset the game world Antica to the state of April 14, 10:00 CEST, due to a technical problem. We would like to offer our sincere apologies for any inconvenience this has caused.
Source April 26 2017- https://www.tibia.com/news/?subtopic=newsarchive&id=4063
Unfortunately, we had to reset Antica to the state of April 25, 20:20 CEST due to technical difficulties. As compensation there will be a double XP/skill weekend on this game world between the server saves of April 28 and May 01.
Source: https://tibia.fandom.com/wiki/Server_Reset
There's other times that servers got a reset due to crashing too, it doesn't happen in just Antica or in one particular world. Here's another example of how a server got crashed:
Another example which I remember (it took place on Guardia about 3-4 years ago) was throwing a huge amount of items into the depot and setting up the bot that would get in and out of the depot SQM. It caused crashes of the whole server.
Source: https://www.tibiaqa.com/14261/what-are-some-major-bugs-that-tibia-experienced