Several errors causing Lost communication with MCU 'mcu'

Your bandwidth is quite high Advanced Trouble-Shooting / Graphing Klipper.

More than half of your klippy.log is filled with: Unknown command:“M205”
Maybe Crealty Ender 3 unknow command M205 over and over and over · Issue #610 · Klipper3d/klipper · GitHub?

Good luck, hcet14