Reasons I found for the dump:
-Bear Market
-Very bad marketing, Binance competition just made it worse
-1M NANO account dumping coins daily ! (10.000-50.000 each time: xrb_3hmcxznhr6edmq14gmwaxwippcjhb5m6fs5633qktk688iysbnq96oyrtbe7)
Reason why I'm not selling
-Good fundamentals ( good working product with huge and active community), no reason for price to dump any further if not fear or price suppression
-RSI oversold on 4h with a bullish divergence
-When the market will turn bullish the bounce will probably be fast, I don't want to miss it
-In the mid term there is a 200%+ potential gain
UPDATE 29/05/2018
That is what I was talking about ! It broke resistances of downtrend line and RSI and made +16% in 3 hours, it's just the beginning