For miners it's always about the dollar value, ETH mining might end any time so people are rushing to get their ROI out before it's too late, sat might be lower but value is increasing since ETH keeps surging, it's a good thing overall, who mines and hold ETH for long term when they have to pay electricity bills ??
Keep holding hehe, most miners also hold in 2018 and we know what happened in the end, best thing is make a target and sell, do not hold for much longer, eth price has been increasing no stop, meaning, once it starts crashing then will not stop till the bottom which will be arund 200 - 500 usd.