ESO has always been somewhat notorious for its instability when it came to the servers... on top of all the Steam and EU issues. But things did take a worse turn when the Markarth DLC launched. It got so bad that people were getting regular crashes and blue screens--even on consoles. I personally always had an odd ping (100 - 150 on EU while other MMOs get around 60 - 100), but never experienced any random CTD even back on my laptop; but now it happens rather often. My ping also fluctuates quite a lot, jumping from 90 to 800 at the most random times.
The worst thing is, this happens to at least someone 80% of the time when I'm trying to run a Dungeon. Either me or someone from the group will crash eventually, multiple times even throughout the run. I mean, has ZOS actually commented on this? Have there been any improvements at all?