My Memory Fragments that I acquired from completing the quests associated with them have disappeared from my inventory, and I currently cannot grab another quest from the Exo Stranger, and as such I cannot get the last two fragments I need. The quest was completed, turned in, and I had the two fragments in my inventory. I logged off for the night, logged back in the next day, and they were gone, and I can no longer acquire either the fragments or the quests. Any help would be appreciated, or I supposed I just won't be able the play with the fragments.