I encoutered te same issue with my USB Gateway.
I'm now powering it with an external 7.2V supply (VIN/GND), but still the same log list as mentionned up.
Any idea ?
I've build on a bredboard a new one with other component. When power on, the Gateway reboot (I can see that in Domoticz). could it be a Sensor problem ?
2017-10-03 20:35:36.864 MySensors: Gateway Ready...
2017-10-03 20:35:36.939 MySensors: Gateway Version: 2.1.0