We ran into the same problem last night and found that, for some reason, the download failed when the Competition Switch was plugged in. We had not noticed the problem previously and do not know why it showed up last night. If you are using a Competition Switch to enable/disable he robot when testing, try unplugging it from the joystick before downloading.
We have expereinced this problem (or a very similar one) numerous times this season. The solution has been to reload the firmware into the joystick. There does not appear to be a pattern for why it occurs.
Our typical solution is to reload the RobotC Firmware to the Cortex. Then reload the program. We had the same thing happen with the Pics previously. We have noticed that sometimes, not always!?!, the Competition switch needs to be unplugged.
Hi, I’m a Mentor in Puerto Rico for CAV 2203A & B and JAD 2256A & B. We had the same issue with some Cortex. We had to reload the firmware several time to correct the issue. Mostly to the Micro Cortex and some times to the Joystic remote control. We notice if the Cortex feel any forced motor or any voltage variation, the firmware goes corrupted. At this time we had to reload again. Some times randomly the motor fails to work correct. At this time we had to reload the firmware again. I which a new firmware soon.