PyODPS脚本任务不定时出现 IncompleteRead问题

from odps import ODPS
from odps import options

options.tunnel.use_instance_tunnel = True
options.tunnel.limit_instance_tunnel = False

sql_query="select * from dwd.table_name where day='20190101'"
instance = o.run_sql(sql_query)
instance.wait_for_success()

with instance.open_reader() as reader:

print(u'共加载到%d条数据' % reader.count)
for item in reader:
    print (item)

使用上述方法读取odps上的数据时，会不定时的出现：

......
http.client.IncompleteRead: IncompleteRead(284 bytes read, 2785 more expected)

During handling of the above exception, another exception occurred:

......

raise ProtocolError('Connection broken:%r' %e, e)
urllib3,exceptions.ProtocolError:('Connection broken:IncompleteRead(7455 bytes read)',IncompleteRead(7455 bytes read) )

安装pyodps时，需要urllib3依赖，从错误日志中可以看出，上述现象和odps.tunnel.io.reader_c.TunnelRecordReader.__next__
odps.tunnel.io.reader_c.BaseTunnelRecordReader.read 有关系。

请问，这是什么原因导致的，怎样解决？