Bukkit

i'have a big problem, a player on my server made a door systeme with piston / dispenser / note block and code to  open it but when he turn on the mechanism the server freeze...i'am really sorry but i can't find more info to help i've got no error in console just a freeze (time read out for payers and console  commands stop working)

using latest crafbukkit RB3 and latest electricraft...the problem happen only when i enable electricraft, it's my favorite plugin so please help ^^ !

i try to screen the system but it's very large...