Hi there,
Thanks for reaching out! Error code: ARUGULA is a general networking error that is automatically reported to us when it occurs.
Since you're still experiencing this often, we recommend you refer to our Network Troubleshooting Guide to explore potential solutions to your problem:
https://help.bungie.net/hc/en-us/articles/360049496531-Network-Troubleshooting-Guide
You may also wish to try clearing the download cache, as this can resolve networking errors in rare cases:
https://help.bungie.net/hc/en-us/articles/360049199051-Clearing-the-Console-Cache
If you're on Steam, you can clear the cache by going to Steam>Settings>Downloads>Clear Download Cache.