我的chia是集群900t，是新版，日志文件出错,好久没有爆币了，有一个月了，是哪里出了问题，请教各位大佬

日志文件都是这样的问题：
 
2021-07-23T11:13:59.454 full_node full_node_server : ERROR Exception: Failed to fetch block 610668 from None, timed out, None. Traceback (most recent call last): File “chia\server\server.py”, line 523, in wrapped_coroutine File “chia\full_node\full_node_api.py”, line 106, in new_peak File “chia\full_node\full_node.py”, line 397, in new_peak File “chia\full_node\full_node.py”, line 331, in short_sync_backtrack File “chia\full_node\full_node.py”, line 316, in short_sync_backtrack ValueError: Failed to fetch block 610668 from None, timed out 2021-07-23T11:13:59.455 full_node full_node_server : ERROR Exception: Failed to fetch block 610668 from None, timed out <class ‘ValueError’>, closing connection None. Traceback (most recent call last): File “chia\server\server.py”, line 533, in api_call File “asyncio\tasks.py”, line 442, in wait_for File “chia\server\server.py”, line 530, in wrapped_coroutine File “chia\server\server.py”, line 523, in wrapped_coroutine File “chia\full_node\full_node_api.py”, line 106, in new_peak File “chia\full_node\full_node.py”, line 397, in new_peak File “chia\full_node\full_node.py”, line 331, in short_sync_backtrack File “chia\full_node\full_node.py”, line 316, in short_sync_backtrack ValueError: Failed to fetch block 610668 from None, timed out 2021-07-23T11:23:39.209 full_node full_node_server : ERROR Exception [WinError 121] 信号灯超时时间已到, exception Stack: Traceback (most recent call last): File “chia\server\server.py”, line 357, in start_client File “aiohttp\client.py”, line 754, in _ws_connect File “aiohttp\client.py”, line 544, in _request File “aiohttp\client_reqrep.py”, line 890, in start File “aiohttp\streams.py”, line 604, in read aiohttp.client_exceptions.ClientOSError: [WinError 121] 信号灯超时时间已到