Hi, I could not see a thread with this specific issue, except old locked threads. My activities and achievements have stopped appearing on the activity feed. In addition last 30 day XP has reduced to zero, though the total XP on the left is still there.
This occured after one of the following activities:
1) I recorded, edited and uploaded a clip and shared in upload (harmless clip of gameplay in Far Cry 4). When testing the clip in upload it returned an error.
2) I unlocked the Reign of Death achievement in Far Cry 4, but in Outpost Master mode. It unlocked just before I got killed; I then exited the mode - I have subsequently gone back and made up for what I think was the shortfall in kills that might have occured from exiting earlier.