resolve Maximum number of clients reached

sudo ss -x src "*/tmp/.X11-unix/*" | grep -Eo "[0-9]+\s*$" | while read port
do
  sudo ss -p -x | grep -w $port | grep -v X11-unix
done | grep -Eo '".+"' | sort | uniq -c | sort -rn

13 "dde-session-dae"
 5 "fcitx"
 3 "kwin_x11"
 3 "kglobalaccel5"
 2 "cpis-panel-serv"
 1 "uos-activator"
 1 "startdde"