Re: strange lights (from the Official Answers Forum)

[Simmons_2.0]

@tabor473

The controller and the brain work fine for about 15-20 seconds and then the LEDs on the controller all turn red and it loses connection.

We are currently running easycV4 for cortex, a vexnet cortex, one battery, and a backup battery.

I would recommend this thread: Cortex/Joystick constantly resetting? - UNOFFICIAL Tech Support - VEX Forum

tl;dr: Probably your joystick batteries are dead. If not, you may need to upgrade your mastercode (in both your joystick and your cortex).