(Scrapy-Redis) Error caught on signal handler: <bound method RedisMixin.spider_idle of spider - scrapy

Question

I have three machines on Azure. One is for redis server. The others are crawlers. But, they showed this message after few hours. Did anyone encounter this situation before? Thanks.
2023-02-04 10:58:14 [scrapy.utils.signal] ERROR: Error caught on signal handler: <bound method RedisMixin.spider_idle of <Spider at 0x29ca19e9580>>
Traceback (most recent call last):
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\connection.py", line 812, in read_response
response = self._parser.read_response(disable_decoding=disable_decoding)
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\connection.py", line 318, in read_response
raw = self._buffer.readline()
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\connection.py", line 249, in readline
self._read_from_socket()
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\connection.py", line 192, in _read_from_socket
data = self._sock.recv(socket_read_size)
ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the remote host
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\ProgramData\Anaconda3\lib\site-packages\scrapy\utils\signal.py", line 30, in send_catch_log
response = robustApply(receiver, signal=signal, sender=sender, *arguments, **named)
File "C:\ProgramData\Anaconda3\lib\site-packages\pydispatch\robustapply.py", line 55, in robustApply
return receiver(*arguments, **named)
File "C:\ProgramData\Anaconda3\lib\site-packages\scrapy_redis\spiders.py", line 205, in spider_idle
if self.server is not None and self.count_size(self.redis_key) > 0:
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\commands\core.py", line 2604, in llen
return self.execute_command("LLEN", name)
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\client.py", line 1258, in execute_command
return conn.retry.call_with_retry(
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\retry.py", line 49, in call_with_retry
fail(error)
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\client.py", line 1262, in <lambda>
lambda error: self._disconnect_raise(conn, error),
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\client.py", line 1248, in _disconnect_raise
raise error
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\retry.py", line 46, in call_with_retry
return do()
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\client.py", line 1259, in <lambda>
lambda: self._send_command_parse_response(
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\client.py", line 1235, in _send_command_parse_response
return self.parse_response(conn, command_name, **options)
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\client.py", line 1275, in parse_response
response = connection.read_response()
File "C:\ProgramData\Anaconda3\lib\site-packages\redis\connection.py", line 818, in read_response
raise ConnectionError(f"Error while reading from {hosterr}" f" : {e.args}")
redis.exceptions.ConnectionError: Error while reading from X.X.X.X:X : (10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None)
Expect to get the clue/suggestion/solution.