A fix is available on IBM Fix Central. This interim fix is strongly recommended for all 8.5.2 Community Servers to avoid this negative effect on the server performance. The fix name is 188.8.131.52-Lotus-ST-IF-NTOR-8KJA7G.You might detect excessive network traffic when using Sametime Community Server 8.5.2. Other symptoms are deferent delays during log-in and chats. This traffic is due to a high number of redundant presence notifications, reported to IBM as APAR# LO62831 (SPR# PPLV8KJ9J3).