I run 5 clients (tried both WZ and IMG) on 1 PC and 3 client (IMG only) on a second PC. Every time I go into zakum by myself, multiple clients will disconnect by going to login screen (always seems to begin after body 2 starts, and the timing to DC is random, but never in the first 10 min of zak), the DC occurs at the same time between the 2 PCs, some clients will remain and some will dc. GFXing has not helped. I haven't figured out what's causing the DCing to take place. Edit: i've only started doing this zak runs in Feb this year.
