Edit my post, I found the offical bluepost:
Since the release of Patch 7.2, we’ve been working to resolve issues with realm performance that were causing players to experience heavy latency and/or disconnects on the Broken Isles. As our investigation has continued, we’ve discovered that many of these issues were being inadvertently caused by addons intended to automate the creation and joining of groups via the Group Finder, even for players who were not using those addons.
Today, we’ve changed what addons can do when interacting with Group Finder, in order to address major performance issues with the game service for players— not just for those using these addons, but for others as well.
In order to alleviate those issues, we’ve recently applied a hotfix that changes how addons interact with the Group Finder. Players will now need to give a manual confirmation when an addon attempts to:
- List and delist a Group Finder group.
- Search for and request an invite to a Group Finder group.
Addons that are affected by these changes will need to be updated to comply with this new restriction. We understand that this is a relatively sudden change, but it was important to resolve the performance issues as quickly as possible.
Note: If you are not using an addon that modifies the Group Finder feature, you should not encounter any issues resulting from this change.