Notify with telegram group

Configuration
1

I’m experiencing a strange issue when telegram sends to group messages.

the messages are getting delivered but some are not sent at all.

here is the event log, anyone has an idea why?

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/homeassistant/.homeassistant/deps/telegram/utils/request.py", line 132, in _request_wrapper
    resp = self._con_pool.request(*args, **kwargs)
  File "/home/homeassistant/.homeassistant/deps/urllib3/request.py", line 70, in request
    **urlopen_kw)
  File "/home/homeassistant/.homeassistant/deps/urllib3/request.py", line 148, in request_encode_body
    return self.urlopen(method, url, **extra_kw)
  File "/home/homeassistant/.homeassistant/deps/urllib3/poolmanager.py", line 244, in urlopen
    response = conn.urlopen(method, u.request_uri, **kw)
  File "/home/homeassistant/.homeassistant/deps/urllib3/connectionpool.py", line 649, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "/home/homeassistant/.homeassistant/deps/urllib3/util/retry.py", line 347, in increment
    raise six.reraise(type(error), error, _stacktrace)
  File "/home/homeassistant/.homeassistant/deps/urllib3/packages/six.py", line 685, in reraise
    raise value.with_traceback(tb)
  File "/home/homeassistant/.homeassistant/deps/urllib3/connectionpool.py", line 600, in urlopen
    chunked=chunked)
  File "/home/homeassistant/.homeassistant/deps/urllib3/connectionpool.py", line 386, in _make_request
    six.raise_from(e, None)
  File "<string>", line 2, in raise_from
  File "/home/homeassistant/.homeassistant/deps/urllib3/connectionpool.py", line 382, in _make_request
    httplib_response = conn.getresponse()
  File "/usr/lib/python3.4/http/client.py", line 1172, in getresponse
    response.begin()
  File "/usr/lib/python3.4/http/client.py", line 351, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python3.4/http/client.py", line 313, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
  File "/usr/lib/python3.4/socket.py", line 371, in readinto
    return self._sock.recv_into(b)
  File "/usr/lib/python3.4/ssl.py", line 745, in recv_into
    return self.read(nbytes, buffer)
  File "/usr/lib/python3.4/ssl.py", line 617, in read
    v = self._sslobj.read(len, buffer)
urllib3.exceptions.ProtocolError: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/srv/homeassistant/lib/python3.4/site-packages/homeassistant/components/notify/telegram.py", line 122, in send_message
    parse_mode=parse_mode)
  File "/home/homeassistant/.homeassistant/deps/telegram/bot.py", line 125, in decorator
    result = func(self, *args, **kwargs)
  File "/home/homeassistant/.homeassistant/deps/telegram/bot.py", line 151, in decorator
    result = self._request.post(url, data, timeout=kwargs.get('timeout'))
  File "/home/homeassistant/.homeassistant/deps/telegram/utils/request.py", line 207, in post
    **urlopen_kwargs)
  File "/home/homeassistant/.homeassistant/deps/telegram/utils/request.py", line 138, in _request_wrapper
    raise NetworkError('urllib3 HTTPError {0}'.format(error))
telegram.error.NetworkError: urllib3 HTTPError ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))
17-02-24 09:29:30 ERROR (Thread-3) [homeassistant.components.notify.facebook] At least 1 target is required
2

After some observation, i noticed that the 1st triggered notification is always skipped, but the sequentials are delivered.

lets say:
Door1 trigger > message not send and i get the error messages in the log
Door2 trigger > message delivered
Door3 trigger> message delivered

3

There are actually threads about this around already: