Error 90002 upon final boss spawning, or joining an instance.

[Raifuru]

So this issue is an odd one that I'm not sure how to approach. I've had two instances of this happen. They're usually a bit rare, but they've been picking up as of late, so I'm a little concerned.

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When joining an instance (In many cases, a 24-man raid instance), I am ejected just as the area is loading and forced to the start menu, where I can try to log into the game with my character. A box tells me clearly that my character is logged in, and will be logged out. Then, after a bit of waiting, I can get back in.

The very same thing seems to happen during 4 man dungeon instances, but they only happen as the last boss spawns. It'll happen during the 'fade out' sequence where a cinematic will play, introducing the boss. Like before, I'm dropped out to the start menu with a 90002 error, and once again, informed my character is logged in, and will be logged back out so I can join.

It's normally not a problem, since I'm usually back in a minute, but with server ques as they are with Shadowbringers, I'm waiting for around 1000+ players before I can get back in.

I'm hoping that, maybe, disabling the 'auto-skip pre-seen cinematic' might help with this. I'll be doing so once I'm back in, as I'm waiting for players as we speak.

As far as I'm concerned, my internet connection is stable. I've had no issues with my ISP.
I've also tried a GPN to see if it was indeed a packet issue or anything of the sort, but this doesn't seem to be the case, as it too happened when using the GPN.

The connection is Wired.
PC.
It's very reliable at about 100 Mbps, with ports open for FFXIV.

I've disabled all other programs in the background to see if it would help. They did not.

I'll follow up with any info as needed, as well as results on if turning off 'skip seen cinematic' will have any effect.

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I should note that these are the only instances I have a 90002 error. I have never had a 'random' 90002 error ever. And since I don't exactly switch servers when viewing a cinematic in an instance I'm already in, maybe the problem is client side?

Update:
Apparently it does happen in single-player instances. Just randomly dropped from one just in the middle of it.
Won't say which one, for spoiler reasons, but it's a level 76 one.

2nd Update:
Setting it to watch the cutscenes seems to be working so far. I haven't had a random DC yet.

3rd Update:
It did not help.
And now it will disconnect me after cinematic involving the boss dying. In the case where I need to exit the dungeon to finish a quest, it won't happen. Which means I have to do the dungeon from the start.

Does -anyone- have a fix for this? I'm really tired of being disconnected at the same times for a reason I have no idea about, and getting forced back into a long queue line for something out of my control.

[Raifuru]

Nothing? Am I gonna be cursed by this?