Its multipools and their incessant raping of all alt coins.
When the difficulty drops to 40, then it is a hugely profitable coin to mine. So the multipools jump on, the hash rate goes very high, and blocks are found very quickly, with the bulk of the coins going to the pools. They keep mining all the way through the 40 difficulty which takes no time given the hash rate. Once it changes and goes to difficulty of 130/140, the pools dissapear as they cant find coins as quickly.
They can then dump a load of coins on the exchange, killing the value and leaving a high difficulty.
This the leaves everyone else behind on around 2MH/s working through the blocks - average time for a block goes to around 3 or 4 minutes because the multipools pushed up the difficulty. Then when it comes back down, they join again and blocks are found about every 30 seconds. Gravity well should be compulsory for all coins to kill off these morons.
+1
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