Transfer Aborted: Instance not found

Server: US Lightbringer

I’m getting very frequent errors of “Transfer Aborted: Instance not found” every time I enter some sort of instance including zone changes, entering housing, solo activity like delves, hearthing back, etc. Its happening more than 50% of the time and has been truly detrimental to my experience. I’m a recent returnee to WoW, having purchased Midnight just recently. So that means I did a fresh install of Retail. I never encountered this type of problem back in War Within. It was flawless. Now its pretty frustrating as I cant even do the campaign properly.

Here’s what ive done so far:

1.) Disabled addons
2.) modem reset
3.) deleted WTF, Interface, and Cache folders
4.) Scan and repair
5.) Stuck character service (I waited for the confirmation email before logging back in)
6.) Enabled uPnP on my modem
7.) Changed DNS from my default ISP to 1.1.1.1 and 1.0.0.1
8.) Reinstalled addons
9.) Tried logging on to my alts and playing for a while

It’s still happening.

Rarely i would get the WOW51900319 error after it wont load in the instance. The disconnection is never random. Its always triggered by an instance change. The loading screens take so long to the point that i can already tell “okay its going to abort the instance again”.

Everything is fine everywhere else. Im only having this problem in this game. Really frustrating. Blizzard please help, its been 3 days of finding information and i am exhausted.

Im having exactly the same problem, it always happens when entering an instance while in Group or RAID. Never alone, aldo in BGS. I CANT PLAY THE GAME, its been happening since Sept 16th.

I did everything: WTF INTERACE and all that delete rename. Thing, reset ui totally. Disable And uninstall all addons. Updating drivers EVERYTHING and nothing works.

Im in Mexico through Infinitum if that serves.

I just want to update this thread for those that come after. After a few days I am no longer experiencing this problem. The only conclusion i can make is that I came in at the same time as the WoW Forever Beta and everyone just borked all the servers.

I made no changes at all since the problem, Even left “Optimized Network for Speed” turned on. Maybe blizzard addressed the problem, maybe not. But Im hoping Blizzard can at least let people know that something is wrong so we dont have to run the whole troubleshooting gauntlet over and over again. A note for the future: Perform basic troubleshooting and just wait it out first.