On my Windows 8 PC I use to share movies over my local network my lsass.exe keeps growing and growing when another pc on my lan accesses it to watch movies. The more movies/tv you watch shared over the network the bigger the lsass.exe process takes up ram until eventually the machine just goes so slow I have to power it off and on, it runs for about 2 days until I am forced to reboot because of this memory leak, the ram thats consumed is never returned. I've done some google research and it seems I'm not the only one with the problem but nobody has found a working solution yet. Anyone have any ideas what to do? Thanks -resolved problem I found the issue was resolved for me by working out which machines caused the issue, it turns out it was my media center pc causing my movie storage machine to leak its lsass.exe until I was forced to reboot as the machine was just too slow. So I disabled QOS on the network adapter in the network properties on that media center machine and problem solved. No longer does my movie sharing machine leak ram.