Hashcat Brain not working

[Ulfr11]

i have 3 "Stations" with 6 gpu each connected to a server running hashcat brain, i put the commands and everything starts up as usual, but then the server idles and the Stations get stuck at "[Generating]" candidates, i already tested setting --client-features to 1 to lighten the server load, what can be done to avoid this problem? is actually the Brain feature useable?