Greetings,
While queue times have increased, we have seen no indication that the Duty Finder is experiencing any matching issues since the release of Patch 3.1. For the Void Ark specifically, we're seeing longer wait times for tanks and healers. As Void Ark offers iLv 200 gear, we assume that many players are queuing up to earn gear for their secondary roles which seems to often be tanks. For now, we would suggest forming a full party via Party Finder, or as an alliance, to help alleviate this for the time being.
Also, as mentioned in the Patch 3.1 notes, currently there is a known issue with the Duty Finder display where each of the roles are showing up as 0. Please note that this is only a display error, and the matching process is functioning correctly. The dev. team is currently investigating this issue.
We'll continue to monitor the situation and if we spot any issues or irregularities, we'll be sure to follow up.