Fundamental Reason The last days all of the altcoins pumped and now is time for a quick retracement. BTC.D gain started to grow and take a higher percentage of dominance over the market. ETH needs to have a retracement after it's rising, most likely the alts will follow it and retrace to the previous supports.
Technical Reason At the moment LINKUSD has formed a potential Head and Shoulder pattern. The target is the same as 200-Candles Exponential Movin Average (around $1.73). The trend broke a diagonal support line that makes the price upward movement weaker and places a resistance above it. Link tried to make higher high two times and got rejected. The momentum gets weaker Technically the price has to retrace so that support to be found.