VESC cutoff in full speed and fw update fail

hi

VESC HW 4.12 FW 2.18. 6S BATT 12A

When I reach the final speed I get cutoff.

another problem: I’m trying to install a new version again ( 2.18 ) after upload 100% the vesc Disconnects from computer but does not reconnect. He got stuck Only turn off the battery and turn on again the vesc Connects to the computer without updating I even tried downgradeto version 2.15. Same problem

Does anyone have an idea what to do?