Many things can make altcoin ( XRP ) fall, even sometimes comes from impact. But XRP not alone in this moment, all altcoin has the same condition. If you ask " why ", I believe will not solve your problem, but how good your prepare about this risk?. We all know, no one has control about market and that why stop loss always needed. I suggest you to analyze again your strategy and take action. If still have hope about XRP lets hold but if not just cut loss. Thank you.