Hey guys aside from these power-consumption issues, I am now running the Feather as gateway and node. And I get a strange problem. The gateway is attached to a raspberry pi via usb (by-id), which runs fhem. And everything works great for about an hour to 1 1/2. Then somehow the gateway stops receiving/communicating. I already tried an active USB-Hub incase the power consumption was too high for too long. But that didn't help. I have to reset the gateway and node to make it work again. Did anybody else ever experience similar behaviour?

@tbowmo ha ha ha - at least you are still married

As previously noted, Sensebender Gateway sketch from 2.3.2 with MySensors SAMD Boards 1.0.6 does not compile with Arduino SAMD Boards 1.8.9. Rolling back to Arduino SAMD Boards 1.8.8 or earlier version works.