In my case, my system was : energy acceptor, security terminal, crafting and regular access terminal, storage cell and wireless access point.
My problem is that my energy acceptor disappeared 2 times when I was logging in.
Someone (I can't remember if it was Lance or someone else) told me that this was caused by the security terminal, which sometime makes blocks dissappear if they are near chunck borders.
Now I've moved all my system, and made me controller instead of energy acceptor. I will let you know if it works properly now