It is recommended to update the firmware to the latest version.Please get the latest firmware below, the firmware for the touch screen and motherboard are matching, please update both. Mismatched firmware can cause the printer to function abnormally.
After updating the firmware, please turn off the printer for about 5 minutes. Please remove the USB flash drive when turning on the printer.
Firmware and update instructions download address:
https://www.elegoo.com/pages/3d-printing-user-support
Neptune 4 series printers have faster printing speeds, and a certain amount of noise and vibration is normal. If you're still not satisfied, you can switch to Silent model in settings.
You can also adjust the eccentric nut at the marked position to reduce the friction between the V wheel and the track. thereby reducing noise.
https://www.youtube.com/watch?v=7WKe6dqZfMQ&t=356s （04:15) *The adjustment steps are the same for neptune 3 and Neptune 4 series printers.