Looking through the comments I just want to back up what others have already relayed, Dollie and Ced have tweeted about the Fjordur spawn issues, the team is aware of the Fjordur spawns problem and have been working on a viable fix which we hope to be ready soon in a major version update.
In the meantime we have been redeploying the official servers more often throughout the week than we normally would to help to alleviate the low spawns partially.
And also to confirm that the Summer EVO Event will be extended, but we will announce a new end date for that once an update for the spawn issues is sorted.