My understanding is that these are data errors. Oanda has them semi-frequently(I would say twice a month, at least) and if you enter a trade during one of these, it will be canceled(with oanda, not sure about MT4 brokers)
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Joined Feb 2006
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Status: FXOpen AU Representative
|496 Posts
I checked back and saw the same spikes on saxo bank. If I remember right, they are no longer on Saxo Bank's feed (from the forum) so it's unlikely to happen again very often.