+20.86% You gotta know when to pull the plug....
Turned off my miners this morning...until BTC goes back over $550. Need the fiat.
More bad news:
Estimated Next Difficulty: 28,023,615,809 (+17.53%) in 14 days.
Exactly why does the small difference in price matter so much? Are you instantly selling your coins? Then this wouldn't come as a surprise to me.
Why not keep mining all the time and sell it later if you have to?
I remember the days that I got into this business, the difficulty was 7M (!) or even less. It was quite some time ago.
If I only had a 4 TH/s ASIC then.

Many miners sell BTC to pay their electric bill and/or to purchase new mining gear. So of course a significant portion of earnings are immediately sold.