This is for anyone who has not yet experienced the disappearing Fragments as well as information for Bungie that they may not be aware of (considering most TWaBs that address it brings up the postmaster and other possible solutions, none of which seem to work). Please like and Bump to bring this info to players that are unaware and the possibility that Bungie has not caught on to the criteria that causes them to disappear. Here's what is happening: When you get SIVA Key Fragments dropped into your inventory from the raid, if the amount you receive would put your current on hand total for that character OVER 198, the entire stack will disappear. Plan ahead and make sure you have plenty of room in your stack when doing the raid. Bungie, possibly helpful info: It seems that the Key Fragments are supposed to work like Planetary Materials; stack to 200, excess starts a new stack. However, they are only going up to 198, and will not create a new stack, no matter what source your receive them from (Vault, raid drops, app transfers, etc.). In the case of the WotM raid, the drops making the total go above 198 deletes the entire stack. I hope this information helps and that it is an easy fix, as I am almost completely out of room for these Fragments (on my main account) and will have to stop teaching people how to do this raid, or suffer the frustration of losing ~200 Fragments.