Zigbee ZHA, SerialException every hour or more frequent

Hello,
I have had a Raspberry pi4 whith sonoff zigbee stick but that froze every so often then I switched to Homeassitant green which also froze, so I changed the sonoff stick to conbee II. That doesn’t freeze anymore but the zigbee sometimes stops working. So a long standing issue but I do see that all devices get lost and I see that in the logs

Logger: zigpy_deconz.uart
Source: /usr/local/lib/python3.12/site-packages/zigpy_deconz/uart.py:32
First occurred: 28 October 2024 at 17:53:07 (170 occurrences)
Last logged: 20:38:36

Lost connection: SerialException(‘device reports readiness to read but returned no data (device disconnected or multiple access on port?)’)
Traceback (most recent call last):
File “/usr/local/lib/python3.12/site-packages/serial_asyncio_fast/init.py”, line 141, in _read_ready
data = self._serial.read(self._max_read_size)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/usr/local/lib/python3.12/site-packages/serial/serialposix.py”, line 595, in read
raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)

Any ideas how to fix that?