Extreme, While Danny is working the issue, bypass the cortex and recheck each and every servo for normal operation.. while you are monitoring the current with a current meter.
when you hook the cortex back up, add a 3rd power wire with the signal wire removed from some port in the receiver to the bind port in the cortex. it will provide a bit of additional current capability. Only plug it in after binding and setting up cortex. I do that on all my cortex installs with big servos..
The cortex is a simple parallel bus setup with 2 power inputs (red/white/black).. so all 5 servos are running off that two lines.. It would be feasible to overload the connectors coming in if you fly a 3D plane very hard and long. So like someone said above, you may have to bring power around it, but add the 3rd wire for backup.