A clone Arduino Mega lost USB connection. (1 reply)

I'm running Devuan Linux.

In middle of printing, the USB connection got lost suddenly. Bulbul Junior stalled.
Pronterface was complaining serial port errors.

The USB adapter was gone:
Bus 001 Device 042: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter

$ lsusb
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 005: ID 050d:706a Belkin Components 2-N-1 7-Port Hub (Upper half)
Bus 001 Device 002: ID 050d:0706 Belkin Components 2-N-1 7-Port Hub (Lower half)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 003: ID 056a:0017 Wacom Co., Ltd CTE-450 [Bamboo Fun]
Bus 004 Device 002: ID 04b4:0101 Cypress Semiconductor Corp. Keyboard/Hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

I removed the RAPMS 1.4 shield from the board and plugged in USB cable. It wouldn't response.
Hmm... I plugged in Arduino Uno with the same USB cable. Uno was working fine.

The clone Arduino Mega came with a RAMPS 1.4 kit I bought one and half years ago.
This board had been running for printing 5 kg of PLA. I wouldn't expect it lasts few years anyway.

If I replace the USB driver chip on it, would it be usable again?
I might give a try for learning experience.