I've been having some of my Garrison quests being randomly deleted during server reset. The most notable one was my "Nemesis" quest for my garrison.
At first I thought it was a glitch with the game, but then people on here said that theirs was working fine. So I turned off some of my larger addons to see if it was that, and bingo, no more quest deletions.
Now the problem is narrowing it down to which addon was the culprit. All of my addons were up to date (use curse client to keep them all up to date)
The big ones that I can see with the power of messing with my quest log are Xperl, Gladius, and DBM. I also had Tidyplates, HandyNotes, Clique, and Grid.