Unfortunately, the Ark server software does sometimes crash and there is nothing we, as a hosting company, can do about it. Your server will be automatically restarted within a few minutes and you'll be able to connect again. Unfortunately, anything you've done since the last save (usually 5-15 minutes) will be lost.
Here are some facts we know about Ark server crashing:
Sometimes a new Ark release have bugs that cause an unusually high number of crashes. When this happens, we'll usually see a fix a few days later.
The vast majority of crashes are due to problems with mods. Some mods are incompatible with new versions of the Ark server. Some mods are incompatible with each other. You could try disabling some mods to see if things get better.
In rare cases, the save files become corrupted in a way that lets the server run, but crashes every time a particular player tries to either sign in, or do something. To check if this is happening to you, use the Backup tab to take a backup of your save, then use the Wipe button under Basic Settings to delete your save files. If this fixes the crashing, your save file is corrupted and will have to be abandoned. If your save files are fine, you can then restore them from the Backup tab.
We do not have any log files that you might use to figure out which mod or user is the culprit. If the server software produced any such logs, we would gladly give them to you. But it doesn't, so we can't!