GPU driver is lost when reboot the system

I install the driver on Ubuntu 18.04. But SOMETIMES, the diver is lost after rebooting.

The output of nvidia-smi is:
NVIDIA-SMI has failed because it couldn’t communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.

The output of lspci | grep -i nvidia is
01:00.0 VGA compatible controller: NVIDIA Corporation Device 2184 (rev a1)
01:00.1 Audio device: NVIDIA Corporation Device 1aeb (rev a1)
01:00.2 USB controller: NVIDIA Corporation Device 1aec (rev a1)
01:00.3 Serial bus controller [0c80]: NVIDIA Corporation Device 1aed (rev a1)nvidia-bug-report.log.gz (99.1 KB)

I also upload the bug report log.

Any suggestion is appreciated.