This is normal, and is not the responsibility of the manufacturer to resolve. You purchased this device with the understanding that it was not exclusive to you and that network hashrate increasing means profit decreasing. If you were not aware of this, then that is your own fault. The situation is the same and always has been the same, since the earliest days of mining - additional miners will share the profits, they do not create extra profits out of thin air.
At the beginning of the first batch (2018/08) , our sales price did not exceed $4350. Dayun as our agent added too much money. I am sorry to be late for our website.
dayun's reseller websites sold it around 4500 ~4850 usd. dayun just make profit 10 percent. i asked you: is this machine worth 4350 usd.how much profit do you make. we paid alot. most of us paid around 5500 ~6000 usd.roi is around 600 days. think about it. now is here most of zig1 owners sell their machines just 2000 usd.