Watching in the system journal as I double-click the RST button I see this:
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Apr 20 09:01:39 bluebird kernel: usb 1-3.3: new full-speed USB device number 54 using xhci_hcd
Apr 20 09:01:40 bluebird kernel: usb 1-3.3: new full-speed USB device number 55 using xhci_hcd
Apr 20 09:01:40 bluebird kernel: usb 1-3.3: New USB device found, idVendor=239a, idProduct=000c
Apr 20 09:01:40 bluebird kernel: usb 1-3.3: New USB device strings: Mfr=2, Product=1, SerialNumber=0
Apr 20 09:01:40 bluebird kernel: usb 1-3.3: Product: Adafruit Feather
Apr 20 09:01:40 bluebird kernel: usb 1-3.3: Manufacturer: Adafruit In
Apr 20 09:01:40 bluebird kernel: cdc_acm 1-3.3:1.0: ttyACM0: USB ACM device
Apr 20 09:01:40 bluebird mtp-probe[7862]: checking bus 1, device 55: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3.3"
Apr 20 09:01:40 bluebird mtp-probe[7862]: bus: 1, device: 55 was not an MTP device
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Apr 20 09:01:50 bluebird kernel: usb 1-3.3: reset full-speed USB device number 55 using xhci_hcd
Apr 20 09:01:50 bluebird kernel: usb 1-3.3: device firmware changed
Apr 20 09:01:50 bluebird kernel: usb 1-3.3: USB disconnect, device number 55
Apr 20 09:01:51 bluebird kernel: usb 1-3.3: device not accepting address 58, error -71
Apr 20 09:01:51 bluebird kernel: usb 1-3.3: new full-speed USB device number 59 using xhci_hcd
Apr 20 09:01:51 bluebird kernel: usb 1-3.3: Device not responding to setup address.
Apr 20 09:01:52 bluebird kernel: usb 1-3.3: Device not responding to setup address.
Apr 20 09:01:52 bluebird kernel: usb 1-3.3: device not accepting address 59, error -71
Apr 20 09:01:52 bluebird kernel: usb 1-3-port3: unable to enumerate USB device
Otherwise, the device seems to be working correctly. But then I go to change something in the programming, which of course breaks something and I have to debug it. But I can't because the Serial port will not keep working long enough.