After rebooting the system and restarting the boinc GPUGRID,
it first runs normally, but then appear error:
$ nvidia-smi
Unable to determine the device handle for GPU 0000:02:00.0: Unknown Error

which of your two machines are you talking about?
The one running Linux or the other one running Windows?

After rebooting the system and restarting the boinc GPUGRID,
it first runs normally, but then appear error:
$ nvidia-smi
Unable to determine the device handle for GPU 0000:02:00.0: Unknown Error

this happens when the driver crashes or the GPU has some kind of problem and drops off. only a reboot can bring it back.

check your power and PCIe connections to make sure they are good. I mostly encountered this issue with dodgy power cables.

edit- scratch that, I see that these are laptops now. so not much you can do really for checking power connections. it could be that the cards are overheating when trying to run GPUGRID tasks. make sure the laptops have adequate airflow and are maintaining reasonable temps. maybe reduce overclocks if any. that might be all you can do without getting into the weeds and taking it apart to replace thermal paste, etc.

---

which of your two machines are you talking about?
The one running Linux or the other one running Windows?

it's the linux one.

---

Linux and I think that looks like driver crash as explained here.

Windows machine case I think I don't have the right OpenCL NVIDIA library/driver
or some issue like that and the GPUGRID didn't start at all in the windows11 machine.
Could you advice where to download the required driver for the windows11?
Or is there any other reasons causing this?

I will try the thermal paste change as soon as I receive it by post.
Currently I have the Kryonaut extreme 14.2W/mK and I will try
some other brand that says 14.6W/mK.

Always best to grab Nvidia drivers straight from Nvidia. Get the Studio drivers.
https://www.nvidia.com/Download/index.aspx?lang=en-us#

ok.
I got that drivers, but installation could be difficult issue.
Currently with MX-Linux driver version is: 510.47.03
and downloaded version is later: 510.73.05.

Do a sudo apt purge *nvidia* to get rid of the existing drivers and reboot

That will put you on the stock Nouveau drivers.

Then install the new Studio 510.73.05 drivers.

You should get the OpenCL component necessary for other projects and the current CUDA 11.6 libraries bundled into the Desktop driver.

I removed the drivers with:
sudo ddm-mx -p nvidia

But the NVIDIA-installer still says that the drivers are there and refuses to install the later driver version:

nvidia-installer log file '/var/log/nvidia-installer.log'
creation time: Fri May 27 18:38:09 2022
installer version: 510.73.05

PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

nvidia-installer command line:
    ./nvidia-installer

Using: nvidia-installer ncurses v6 user interface
-> Detected 8 CPUs online; setting concurrency level to 8.
-> Installing NVIDIA driver version 510.73.05.
-> The NVIDIA driver appears to have been installed previously using a different installer. To prevent potential conflicts, it is recommended either to update the existing installation using the same mechanism by which it was originally installed, or to uninstall the existing installation before installing this driver.

Please review the message provided by the maintainer of this alternate installation method and decide how to proceed:

Please use the Debian packages instead of the .run file.


(Answer: Continue installation)
-> Running distribution scripts
   executing: '/usr/lib/nvidia/pre-install'...
   
   
   
   
   If you want to use the nvidia-installer please uninstall the Debian packages
   first.  The two methods of installation cannot be used at the same time.
   
Terminating nvidia-installer in 1 seconds.   
   Killing nvidia-installer

Can't help you here. I know nothing about MX-Linux.

Commands are entirely foreign to me.

I know Ubuntu and Debian. And use the graphics-drivers ppa.

I get rid of older drivers with a purge.

It sounds like you are running the Nvidia .run.sh installer perchance.

I believe it has its own uninstaller by running the Nvidia driver .run.sh script again with the --uninstall option.

The command sequence found to remove the NVIDIA MXLinux driver is possibly:

apt purge nvidia* -y
apt-get purge $FORCE $(apt-cache pkgnames | grep nvidia | grep -v detect | grep -v cleanup | cut -d':' -f1) bumblebee* primus* primus*:i386 2>&1
apt autoremove

and then new driver version 510.73.05 was installed and the system
stopped crashing:

Sat May 28 12:40:23 2022       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 510.73.05    Driver Version: 510.73.05    CUDA Version: 11.6     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                               |                      |               MIG M. |
|===============================+======================+======================|
|   0  NVIDIA GeForce ...  Off  | 00000000:02:00.0 Off |                  N/A |
| N/A   72C    P0    N/A /  N/A |   2291MiB /  4096MiB |      3%      Default |
|                               |                      |                  N/A |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|    0   N/A  N/A      1418      G   /usr/lib/xorg/Xorg                  4MiB |
|    0   N/A  N/A      3344      C   bin/python                       2285MiB |
+-----------------------------------------------------------------------------+

Congrats, well done!