Queue times usually depend on the number of players queueing for the content and the role distribution. There may be fewer players queueing for the 8/24man content than normal, making it harder for the system to fill out parties for those roulettes.

It may be coincidence but your issues with the queue times just happen to coincide with the FFXVI release. Certainly that's impacted the number of players actively playing FFXIV right now. I've been getting a lot of "oh I'm just logging in to check my island and retainers/water my garden before I go back to FFXVI" from friends and FC members.

It's also the start of summer just before a major US holiday. More than usual will be traveling on vacation right now and that will also impact the number of players logging in.