Hi i own a 7d the problem is very likeiy to be in the little pin under the spring on the hot shoe on the right hand side
i have used isopropyl alcohol and a tooth brush when it has worked i then use a little crc or wd 40 on the end of a tooth pick to keep the pin from getting stuck again
i hope this helps
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=== Update (03/08/2019) ===
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Hi again
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if you are living in new zealand i can give you an address to send your cameras to for repairs its CW Services ltd
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62 church street
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timaru
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7910
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new zealand —-or www.camerarepairs.co.nz
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Greg is one of the best techs in nz for canon repairs
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I have used him a few times and his costs are very fair
Hi i own a 7d the problem is very likeiy to be in the little pin under the spring on the hot shoe on the right hand side
i have used isopropyl alcohol and a tooth brush when it has worked i then use a little crc or wd 40 on the end of a tooth pick to keep the pin from getting stuck again
i hope this helps