Hey Despair, as a newbie i cant offer much of a solution but i am wondering about the following:
Did you stop and start the strategy when it failed the first time?
How long or how many trades have this strategy taken before this issue appeared?
Do you run it in demo and live? Did it happen i both?
Could also suggest that you run the same system but on multiple markets on demo just to check if its a bug within your strategy.
Also i would suggest that you run other strategies (non profitable as well) on the same market where youre experiencing these issues. Just to check if its a bug within the market.. This is deinfitly weird and dangerous.