Olympus OMD EM5 doesn't like sand

I took to the sidelines of stage 8 of the Dakar Rally. Here's me using the camera with the Panasonic 7-14mm unsealed lens (which works fine):



I would say in total this camera spent 2 days in areas where there was sand. Never used on a beach, never  used into the wind, never changing lenses in these conditions. I did not expect this to be an issue with the unsealed Panasonic 7-14mm, and certainly didn't expect to cause problems from the camera body.

Olympus mentioned "sand ingress" as a contributing factor to the rejection of warranty of my camera. This half day at the Dakar and a previous day waiting for the rally are the only times this camera has ever seen sand.