Ms. Miller's performances in at least 4 races have come under scrutiny. Race officials decided that Ms. Miller did not complete the entire run course during both the 2013 and 2015 Ironman Canada events, and her performance at the 2014 Subaru Vancouver Triathlon was negated after the timing company reported widely variant times over the 4 loops of the bike course. On September 3, 2015, Ironman indefinitely suspended Ms. Miller from all its events, and her results at both these Ironman races were negated.

Triathlon Canada's executive director, Tim Wilson, was asked at which races the Code of Conduct violations took place. There were "multiple breaches," according to Mr. Wilson, but he "can't specify the events."