We have now seen twice a problem where the Sonar board is put on the Magni and the tall standoff in the center top front bar of the magni is somehow loaded then shorts on the Sonar board leading to damage.
IF YOU HAVE A SONAR BOARD PLEASE CHECK FOR THIS AND REMOVE THAT STANDOFF while red battery lead is disconnected.
ONLY 4 standoffs, 2 on the right side and two on the left side are used and only where the sonar board clearly has the large holes meant for a M3 screw.
Yesterday we updated with bold red print the install section for Sonar board to alert anybody else but there may be units right now just waiting to short out of pressure is applied to the board or something.
Refer to last half of this page: https://learn.ubiquityrobotics.com/camera_sensors