EOS-1D X Horizontal Shutter Button Stopped Working, Vertical OK

[DirtTrackPhoto8]

So I have a Canon 1DX and I take racing pictures so yesterday I was taking pictures during the races and all of sudden my horizontal shutter quit working like it was stuck the vertical one still works I tried changing cards the battery cleaned the contacts from the body and lens it still doesn’t work when I don’t even have a lens on it wondering if anyone else has had this issue 

[ebiggs1]

"... sending it in for a good once over and a clean and check!"

Every time I sent in a camera for a C&C they came back looking brand new. The guys and gals do a fantastic job and they did it quickly.