I can confirm that multiple players are having this issue. One of my friends had their friend's list dropped by 200. They were also missing 100 friend requests and multiple players that they had put on their ignore list.

Another friend of mine lost 34 friends yesterday, 100 requests, and 5 players off of his ignore list.

This is also an ongoing issue. These players are claiming that everytime they log in, their friend's list/friend requests/ignore list continues to drop.