VEXnet LED turning red for a second

When I’m activating motors on a gear to drive grasping arms, the VEXnet LED on the remotekeeps switching to red for a half second, and the Robot LED turns off.
On the robot, the same LEDs do the same thing.

When that happens, the robot appears to ‘freeze up’ and not accept any inputs until all the lights are back to green.
I’m using simple programming, so there should not be issues there.

It sounds like you’re losing connection. If you’re using an A-to-A cable, try VEXnet keys. If you are using keys, you can try taping it in on the Cortex to ensure a secure link. Also, at a tournament, you can have a 9V backup battery connected, so you could try adding the backup battery and see what happens.