Every two weeks i get this:
$ xterm & Xlib: connection to ":0.0" refused by server Xlib: Maximum number of clients reached xterm Xt error: Can't open display: :0.0
and it looks that something eats up the possible number of Clients:
$ xlsclients |wc -l 56
when i restart X i can open about 100 xterms until i reach the error message.