Ошибка при запуске большого количества потоков threading Python

Есть программа запускающая несколько потоков, если количество потоков превышает примерно 20-25, то начинают появляться вот такие вот исключения/ошибки (внутри потоков присутсвуют HTTP запросы и вполне вероятно, что дело не в потоках, а именно в запросах, я не понимаю...):

Exception in thread Thread-136:
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/connection.py", line 159, in _new_conn
    conn = connection.create_connection(
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/util/connection.py", line 84, in create_connection
    raise err
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/util/connection.py", line 74, in create_connection
    sock.connect(sa)
TimeoutError: [Errno 60] Operation timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/connectionpool.py", line 670, in urlopen
    httplib_response = self._make_request(
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/connectionpool.py", line 381, in _make_request
    self._validate_conn(conn)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/connectionpool.py", line 976, in _validate_conn
    conn.connect()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/connection.py", line 308, in connect
    conn = self._new_conn()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/connection.py", line 171, in _new_conn
    raise NewConnectionError(
urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPSConnection object at 0x10f026340>: Failed to establish a new connection: [Errno 60] Operation timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/adapters.py", line 439, in send
    resp = conn.urlopen(
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/connectionpool.py", line 724, in urlopen
    retries = retries.increment(
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/urllib3/util/retry.py", line 439, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='www.ncbi.nlm.nih.gov', port=443): Max retries exceeded with url: /tools/primer-blast/primertool.cgi?ctg_time=1639602621&job_key=aGK34GRaafJOyPnN9K3d_462zM2jpdfQog (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x10f026340>: Failed to establish a new connection: [Errno 60] Operation timed out'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/Users/andrey/itinv/pj/Modules/gp_bt5/gp_clear_code.py", line 437, in get_get_primers
    r = cycreq(requests.get(pb_specific_link))
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/api.py", line 76, in get
    return request('get', url, params=params, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/sessions.py", line 530, in request
    resp = self.send(prep, **send_kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/sessions.py", line 643, in send
    r = adapter.send(request, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/requests/adapters.py", line 516, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='www.ncbi.nlm.nih.gov', port=443): Max retries exceeded with url: /tools/primer-blast/primertool.cgi?ctg_time=1639602621&job_key=aGK34GRaafJOyPnN9K3d_462zM2jpdfQog (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x10f026340>: Failed to establish a new connection: [Errno 60] Operation timed out'))

Сам запуск потоков выглядит как то так:

threads = []
    for element in taken_exons_id:
        t = threading.Thread(target=get_get_primers, args=[element, result_dict])
        t.start()
        threads.append(t)
        time.sleep(1.1)
    for t in threads:
        t.join()

Подскажите пожалуйста в какой момент что идет не так и как это можно исправить?