I have been having the same issue, I will start a craft and it will make 1 or 2 items then just cancel, nothing in the craft monitor. than it just stopped crafting all together. Mostly just when I try to craft any AE items, but some times when I try to craft complex items. I am on a single player world on FTB unleased. My whole network is loaded, no dark cables, or level emeters are on the network. I have multiple sub-networks connected to it, works fine most the time, but than just stops. Restarting the client doesn't even fix it.