Transfer Aborted: instance not found

Since the last patch on Tuesday I get several times a day the message “Transfer Aborted:instance not found”.
Waiting an hour or so for a battle ground and if it pops and I enter the loading bar is not loading and after a while I am kicked out of the q and back where I was.
Also sometimes at exit a battleground I get DC.
Turned off all add-ons, unchecked optimize network and IPv6, reboot PC and router, did repair wow files, nothing works.
This is Oceanic Romulus.
Point out that before the last patch everything worked 100% fine.

This just started happening to me today. Takes about 3-4 attempts to get through a loading screen. Rather frustrating!

Update: Everything works fine again, no idea what fixed it