He genuinely might not know. I worked on a similar incident when our video encoder caused about 30% of a pretty mainstream mobile handset to hard lock when recieving a stream, requiring the battery to be removed to reboot the device.

Neither us nor the OEM ever figured out why. They suspected that it was a weird combination of different bin combinations from different parts, but ultimately we had to change the method of delivering video to stop it happening.

The Dutch broadcasting service hired me to figure out why their homepage was crashing browsers. I turned out to be an animated GIF of two speakers that had an extra 0 interval frame in it which caused IE to crash... it doesn't take much.