I don't think something bad happened with SEMUX. Such drops today maily come from panic sellings. That's all, and such terrible falls can happen with any altcoins when investors panicly sell their coins. It is more convincing because investors tend to cash out their altcoins and buy bitcoin with hope that bitcoin can move higher. Who knows how high bitcoin will move (in reality its rise currently stop around $7500 and have fallen considerably from that), but SEMUX is good at such price around 4xxx satoshis. Therefore, prices below 3xxx satoshis are very good to buy and have more SEMUX.