Now thats strange.... was running my buggy on our track tonite and slighly bumped the weeping tile and...nothing. Walked over to buggy and could hear it beeping. The ESC (Castle MMM) was flashing yellow only and beeping every second or so. Unplugged battery, re-inserted and back to good again. Then as I was ready to put body back on, it started doing it again.
Checked the temp, ok at 120F, wasnt sure of the code it was giving at the time but a few minutes later, plugged the lipo back in, body on and ran it for 5 minutes or so till we decided it was getting too dark.
I too, am on the latest firmware....1st time this has happened and I've ran it 2-3 times a week for the last couple months. I'm going to try reverting back to the last firmware version based on your problem and mine to see if that doesn't cure it.
Weird tho.....