[Personal Story] Victory or Death
I have a similar problem but the instance crash is random, sometimes before I get on the airship and sometimes after I defeat the next part.
For me story instances are more likely to result in a disconnect than general PvE, PvP or WvW. But so far no solution to the problem seems apparent.
Multiple people already reported the same problem (being stuck on the airship): https://forum-en.gw2archive.eu/forum/support/bugs/Victory-or-Death-stuck-on-airship