Printer is trying to drive me crazy... [Errno 5] Input/output error on USB

[Arakon]

Basic Information:

Printer Model: Vz235
MCU / Printerboard: SKR 3 H723, RP2040 canbridge, EBB36
klippy.log
klippy.zip (650.6 KB)

Describe your issue:

I can usually connect to the printer fine at first. Raspberry is powered by a seperate 5V PSU, switching power to the printer via relay.
Half the time, the RP2040 canbridge reports it’s in shutdown. I send firmware_restart, it connects.
But, a lot of the time, the SKR3 just… dies after that. I can print fine when it connects, no errors, no lost data, but after a reset/reconnect, the board suddenly doesn’t respond and I get this error in the log:

mcu 'mcu': Unable to open serial port: [Errno 5] could not open port /dev/serial/by-id/usb-Klipper_stm32h723xx_15000E000851313332323730-if00: [Errno 5] Input/output error: '/dev/serial/by-id/usb-Klipper_stm32h723xx_15000E000851313332323730-if00'

The board is still connected and showing up fine in lsusb/ls /dev/serial/by-id the entire time. Any ideas what the heck could be going on here?

[Arakon]

This issue seems to have fixed itself with a complete reinstall of the linux system. Not sure why, since it was a MainsailOS base and configured exactly the same as before, but it no longer occurs on this new install.