Shopify support sent 2 brand new tap / chip readers and they are doing the exact same thing. The tap / chip readers disconnect after about 24 hours of use - every day they disconnect.
We are implementing a policy to restart them every morning, but a very frustrating device. I just want to buy the old device with the tap / chip / swipe - those were working fine.
Really disappointed with Shopify acting like no one else is seeing this issue.