[question] possible cause for vector XL_ERR_INVALID_HANDLE

### Describe the bug
I setup several buses on a VX1135 device

Each bus is being handled in a dedicated Python process.
I am able to start the buses and acquire CAN data, but when I want to shutdown the buses I often get this error:

```
Traceback (most recent call last):
File "d:\daxil\xil\devices\can_device.py", line 1727, in _acquire
File "d:\Tools\_venv\pyvenv_daxil2_Python310_x64\lib\site-packages\can\interfaces\vector\canlib.py", line 629, in shutdown
File "d:\Tools\_venv\pyvenv_daxil2_Python310_x64\lib\site-packages\can\interfaces\vector\xldriver.py", line 37, in check_status_operation
can.interfaces.vector.exceptions.VectorOperationError: xlDeactivateChannel failed (XL_ERR_INVALID_HANDLE) [Error Code 155]
```

Do you know what can cause this?