Such instances of a trading cutting deep into your profit happens once in a while after so many wins if you know what I am saying. Of course, sometimes, losses are inevitable but most losses usually happen due to an unforeseen or unexpected changes in the market as a result of one news or the other. Most times if i see something strange going on, even after setting my stop loss button, I try as much as possible to keep monitoring the news on that coin to know if I should just accept my loss or keep buying more. As long as your positions are good and you are buying coin with a good support, whatever goes down usually come right back up.