Since patch 6.18, i did a bit of Palace of the Dead run solo and every run end up instance disconnecting everytime at random floors. Last night was at floor 149, few days ago was at floor 111. A week ago was floor 8 and 16. Two weeks ago was floor 38 and 66. I know it happen to a lot of people lately. I haven't tested Heaven on High if those instance crash happen has well. I know it is not internet related because i was able to log back in no problem.