Connection keeps giving me 'Failed to open transport'

Hi.
I have a Hive connection where I insert tons of data and also run 'Insert Overwrite' queries.
Here is my connection file:

```
from pyhive import hive
from app.settings import Settings
import logging
logging.getLogger('pyhive').setLevel(logging.ERROR)

class Hive():
def __init__(self):
settings = Settings.DATABASE.get('CLOUDERA')
self.db = hive.Connection(
host=settings.get('HIVE').get('HOST'),
port=settings.get('HIVE').get('PORT'),
username=settings.get('USERNAME'),
password=settings.get('PASSWORD'),
database=settings.get('DATABASE'),
auth='CUSTOM'
)

def __call__(self):
settings = Settings.DATABASE.get('CLOUDERA')
self.db = hive.Connection(
host=settings.get('HIVE').get('HOST'),
port=settings.get('HIVE').get('PORT'),
username=settings.get('USERNAME'),
password=settings.get('PASSWORD'),
database=settings.get('DATABASE'),
auth='CUSTOM'
)
return self

def get(self, sql):
try:
cursor = self.db.cursor()
cursor.execute(sql)
data = cursor.fetchall()
return data
except Exception as err:
print(err, level='critical')
raise err
finally:
cursor.close()

def execute_query(self, sql):
try:
cursor = self.db.cursor()
cursor.execute(sql)
return True
except hive.DatabaseError as err:
print(err, level='critical')
raise err
except Exception as err:
print(err, level='critical')
raise err
finally:
cursor.close()

def insert(self, table_name, data):
try:
sql = f"INSERT INTO {table_name} VALUES {', '.join(data)}"
cursor = self.db.cursor()
cursor.execute(sql)
return True
except hive.DatabaseError as err:
print(err, level='critical')
raise err
except Exception as err:
print(err, level='critical')
raise err
finally:
cursor.close()
```

In my data load processing, many queries are executed, but some of them gets a 'Failed to open transport(tries_left=3)' error.
Here is the error:
```
[30/10/2020 00:59:49] - ERROR - Failed to open transport (tries_left=3)
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/impala/hiveserver2.py", line 1009, in _execute
return func(request)
File "/usr/local/lib/python3.7/site-packages/thriftpy2/thrift.py", line 219, in _req
return self._recv(_api)
File "/usr/local/lib/python3.7/site-packages/thriftpy2/thrift.py", line 231, in _recv
fname, mtype, rseqid = self._iprot.read_message_begin()
File "/usr/local/lib/python3.7/site-packages/thriftpy2/protocol/binary.py", line 373, in read_message_begin
self.trans, strict=self.strict_read)
File "/usr/local/lib/python3.7/site-packages/thriftpy2/protocol/binary.py", line 165, in read_message_begin
sz = unpack_i32(inbuf.read(4))
File "/usr/local/lib/python3.7/site-packages/thriftpy2/transport/base.py", line 60, in read
return readall(self._read, sz)
File "/usr/local/lib/python3.7/site-packages/thriftpy2/transport/base.py", line 12, in readall
chunk = read_fn(sz - have)
File "/usr/local/lib/python3.7/site-packages/thriftpy2/transport/buffered/__init__.py", line 41, in _read
buf = self._trans.read(max(rest_len, self._buf_size))
File "/usr/local/lib/python3.7/site-packages/thriftpy2/transport/socket.py", line 132, in read
message='TSocket read 0 bytes')
thriftpy2.transport.base.TTransportException: TTransportException(type=4, message='TSocket read 0 bytes')
```
In this example, the third hive query failed all the times, but when executed by itself, it resolved with no error.
I tried to remake the connection using __call__, but it didn't work as well...

Thanks in advance.