Many of getting this problems, May be L3+ have weak hardware, There are many complaints about L3+ miner on the forums and websites. I also got problem in 3 week. And aslo difficulty increased soo much. We dont get earn more but, Bitmain company Earning Super. We are the fools, buying the miner.
I've found complaints on forums to be a bad indicator as to how reliable a product is. The vast majority of people without problems don't post. To date, we've received 110 AntMiner L3+ units straight from Bitmain. Thus far, we've only identified 1 bad hashing board. It's obviously still a young product, but we're finding them to be much more reliable than the S9 series.
This is a great post Ross. Thank you for that endorsement based on experience. I was suspecting as much.