diff --git a/telethon/extensions/markdown.py b/telethon/extensions/markdown.py
index 24ae5aa7..6285bf28 100644
--- a/telethon/extensions/markdown.py
+++ b/telethon/extensions/markdown.py
@@ -192,10 +192,10 @@ def get_inner_text(text, entity):
     :param entity: the entity or entities that must be matched.
     :return: a single result or a list of the text surrounded by the entities.
     """
-    if not isinstance(entity, TLObject) and hasattr(entity, '__iter__'):
+    if isinstance(entity, TLObject):
+        entity = (entity,)
         multiple = True
     else:
-        entity = [entity]
         multiple = False
 
     text = text.encode(ENC)
diff --git a/telethon/extensions/tcp_client.py b/telethon/extensions/tcp_client.py
index 61be30f5..e67c032c 100644
--- a/telethon/extensions/tcp_client.py
+++ b/telethon/extensions/tcp_client.py
@@ -3,10 +3,17 @@ This module holds a rough implementation of the C# TCP client.
 """
 import errno
 import socket
+import time
 from datetime import timedelta
 from io import BytesIO, BufferedWriter
 from threading import Lock
 
+MAX_TIMEOUT = 15  # in seconds
+CONN_RESET_ERRNOS = {
+    errno.EBADF, errno.ENOTSOCK, errno.ENETUNREACH,
+    errno.EINVAL, errno.ENOTCONN
+}
+
 
 class TcpClient:
     """A simple TCP client to ease the work with sockets and proxies."""
@@ -59,6 +66,7 @@ class TcpClient:
         else:
             mode, address = socket.AF_INET, (ip, port)
 
+        timeout = 1
         while True:
             try:
                 while not self._socket:
@@ -69,10 +77,12 @@ class TcpClient:
             except OSError as e:
                 # There are some errors that we know how to handle, and
                 # the loop will allow us to retry
-                if e.errno == errno.EBADF:
+                if e.errno in (errno.EBADF, errno.ENOTSOCK, errno.EINVAL):
                     # Bad file descriptor, i.e. socket was closed, set it
                     # to none to recreate it on the next iteration
                     self._socket = None
+                    time.sleep(timeout)
+                    timeout = min(timeout * 2, MAX_TIMEOUT)
                 else:
                     raise
 
@@ -105,7 +115,7 @@ class TcpClient:
         :param data: the data to send.
         """
         if self._socket is None:
-            raise ConnectionResetError()
+            self._raise_connection_reset()
 
         # TODO Timeout may be an issue when sending the data, Changed in v3.5:
         # The socket timeout is now the maximum total duration to send all data.
@@ -116,7 +126,7 @@ class TcpClient:
         except ConnectionError:
             self._raise_connection_reset()
         except OSError as e:
-            if e.errno == errno.EBADF:
+            if e.errno in CONN_RESET_ERRNOS:
                 self._raise_connection_reset()
             else:
                 raise
@@ -129,7 +139,7 @@ class TcpClient:
         :return: the read data with len(data) == size.
         """
         if self._socket is None:
-            raise ConnectionResetError()
+            self._raise_connection_reset()
 
         # TODO Remove the timeout from this method, always use previous one
         with BufferedWriter(BytesIO(), buffer_size=size) as buffer:
@@ -142,7 +152,7 @@ class TcpClient:
                 except ConnectionError:
                     self._raise_connection_reset()
                 except OSError as e:
-                    if e.errno == errno.EBADF or e.errno == errno.ENOTSOCK:
+                    if e.errno in CONN_RESET_ERRNOS:
                         self._raise_connection_reset()
                     else:
                         raise
diff --git a/telethon/telegram_client.py b/telethon/telegram_client.py
index 7b8a84fa..2f9eaecf 100644
--- a/telethon/telegram_client.py
+++ b/telethon/telegram_client.py
@@ -317,10 +317,7 @@ class TelegramClient(TelegramBareClient):
 
     # region Dialogs ("chats") requests
 
-    def get_dialogs(self,
-                    limit=10,
-                    offset_date=None,
-                    offset_id=0,
+    def get_dialogs(self, limit=10, offset_date=None, offset_id=0,
                     offset_peer=InputPeerEmpty()):
         """
         Gets N "dialogs" (open "chats" or conversations with other people).
@@ -425,11 +422,7 @@ class TelegramClient(TelegramBareClient):
                 if update.message.id == msg_id:
                     return update.message
 
-    def send_message(self,
-                     entity,
-                     message,
-                     reply_to=None,
-                     parse_mode=None,
+    def send_message(self, entity, message, reply_to=None, parse_mode=None,
                      link_preview=True):
         """
         Sends the given message to the specified entity (user/chat/channel).
@@ -523,14 +516,8 @@ class TelegramClient(TelegramBareClient):
         else:
             return self(messages.DeleteMessagesRequest(message_ids, revoke=revoke))
 
-    def get_message_history(self,
-                            entity,
-                            limit=20,
-                            offset_date=None,
-                            offset_id=0,
-                            max_id=0,
-                            min_id=0,
-                            add_offset=0):
+    def get_message_history(self, entity, limit=20, offset_date=None,
+                            offset_id=0, max_id=0, min_id=0, add_offset=0):
         """
         Gets the message history for the specified entity
 
diff --git a/telethon/tl/tlobject.py b/telethon/tl/tlobject.py
index 0ed7b015..ad930f9c 100644
--- a/telethon/tl/tlobject.py
+++ b/telethon/tl/tlobject.py
@@ -134,7 +134,7 @@ class TLObject:
         if isinstance(dt, datetime):
             dt = int(dt.timestamp())
         elif isinstance(dt, date):
-            dt = int(datetime(dt.year, dt.month, dt.day, dt).timestamp())
+            dt = int(datetime(dt.year, dt.month, dt.day).timestamp())
         elif isinstance(dt, float):
             dt = int(dt)