Hello
I have run into the same problem twice now in a few days. Once with an STM32F103 board and once with a genuine micro. Initially the boards work fine, I can upload sketches etc and then for no reason I can explain the board no longer connects (tried Windows, Mac and Linux). The last sketch uploaded is still working so I guess the board is ok but somehow the usb connection with the device fails.
Does anyone have any idea how I manage to get myself in this mess? The procedures I found to reset the bootloader are a bit above me I am afraid so I will soon get a 3rd board. In that context I would really like to avoid the same mistake but I have no idea what that mistake is. So, all tips welcome!
Many thanks!
Peter
PS The Linux system log is as follows
Dec 24 15:01:32 pclap kernel: [31669.550274] usb 1-1: new full-speed USB device number 59 using xhci_hcd
Dec 24 15:01:32 pclap kernel: [31669.700528] usb 1-1: New USB device found, idVendor=2341, idProduct=0037, bcdDevice= 0.01
Dec 24 15:01:32 pclap kernel: [31669.700534] usb 1-1: New USB device strings: Mfr=2, Product=1, SerialNumber=0
Dec 24 15:01:32 pclap kernel: [31669.700537] usb 1-1: Product: Arduino Micro
Dec 24 15:01:32 pclap kernel: [31669.700540] usb 1-1: Manufacturer: Arduino LLC
Dec 24 15:01:32 pclap kernel: [31669.704884] cdc_acm 1-1:1.0: ttyACM0: USB ACM device
Dec 24 15:01:32 pclap mtp-probe: checking bus 1, device 59: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-1"
Dec 24 15:01:32 pclap mtp-probe: bus: 1, device: 59 was not an MTP device
Dec 24 15:01:32 pclap snapd[992]: hotplug.go:199: hotplug device add event ignored, enable experimental.hotplug
Dec 24 15:01:32 pclap upowerd[1331]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1:1.1
Dec 24 15:01:32 pclap upowerd[1331]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1:1.0
Dec 24 15:01:32 pclap upowerd[1331]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-1
Dec 24 15:01:39 pclap kernel: [31677.314421] usb 1-1: USB disconnect, device number 59
Dec 24 15:01:39 pclap upowerd[1331]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1:1.1
Dec 24 15:01:39 pclap upowerd[1331]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1:1.0
Dec 24 15:01:39 pclap upowerd[1331]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:14.0/usb1/1-1