Disconnected from server + time travel?

Been getting a strange bug last 15 minutes or so?
I'm entering the cave in the valley of titans, doing like a minute to 5 at most of the map, then I'm getting "disconnected from server", no additional message, just back to the login screen.
Which would be mostly fine really, except it's like I traveled back in time?
I log back in, and I'm at the entrance to the cave (outside), my instance is gone (checked in instance manager or whatever that window is called), even my exp is back where it was (at 44%).
This happened like 4 times before I gave up.

I don't have any logs or error messages unfortunately, cause there was nothing like that.

same

I don't understand what kind of bug this is, for the second time now while I'm making a map the game kicks me out and says I'm disconnected from the server, then I log in and the loot in the inventory is gone, and oh dear, it's just gone for the second time in a period of 20 minutes.. fix this bug, thanks