Radio cuts out, student's foot run over

[grantf]

We had a somewhat scary incident with our robot yesterday.

Here's what we did:

1. Downloaded v14 firmware to the RC.
2. Drove the robot around for a while and experienced a few intermittent radio cutouts.
3. Disabled the robot at the OI via a "kill-switch"
4. Noticed that the Speed Controller LEDs were still solid orange (i.e. enabled)
5. Powered off the robot and changed the battery (we were about to do this anyway).
6. Powered on the robot and again noticed that the Speed Controller LEDs were solid orange.
7. After about 4 seconds (with 3 people standing around the robot) it took off at about full-speed without user input
8. The robot ran over one of my student's foot before I could get ahold of it and lift it off of it's wheels.

For the record:

• The RC radio was mounted high on the robot and perdendicular to the ground
• The OI radio was mounted high on a wall about 15 feet away from the robot, also perpendicular to the floor.
• The kill-switch on the OI was in the disabled position from step 3 above and was NEVER moved back to enabled.
• The "disable" LED on the OI was solid orange and the RC mode LED was yellow/orange.
• The kill-switch has worked for many weeks now, disabling/enabling without issue.

Has anyone else seen anything like this?
BTW, the student is fine.