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"[…] poor quality video cables […] Surprisingly, we have also seen this issue connected to gas lift office chairs. When people stand or sit on gas lift chairs, they can generate an EMI spike which is picked up on the video cables, causing a loss of sync. […]"

Wtf. Das kann der Grund sein warum wir im Büro seltsame Phänomene hatten.. o_O

Reminds me of the bringup of an old server platform: the board had a debugging cable sticking out, directly connected to the CPU and acting as an antenna. Move the chair the wrong way and it would crash. With a properly connected debug cable it worked fine.