I’ve had a similar issue myself earlier today. When playing through AC, due to players afk’ing for long durations as well as the general trouble in the dungeon, it took us a good two and a half to three hours (I honestly wasn’t paying too much mind, I was enjoying a nice break once in a while) to complete the dungeon and finally kill the Howling King. But as we end the run, I get disconnected. I honestly chalked it up to my internet but checked my connection and it was fine… I reconnect to find my reward to pop up as naught but one tear. Altogether frustrating and left me a little bitter of going back to AC anytime soon, but hey. Here’s hoping we find a cause and fix soon. :/