It is a software issue...I work pretty closely with them since my miners use their chips. Been trying to get a L21 unit from them to help them fix the software but so far they have been out of stock and cant send me one.
What do you mean by "my miners"?
Jstefanop is the entrepreneur and main developer for the FutureBit miniminers.
His latest product is FutureBit Moonlander 2, which is a USB stick miner.
It uses the same 28nm ASIC chip as the BW-L21 miner uses.