diff --git a/pyrogram/session/internals/msg_factory.py b/pyrogram/session/internals/msg_factory.py
index bf44b7d3..98c88b3f 100644
--- a/pyrogram/session/internals/msg_factory.py
+++ b/pyrogram/session/internals/msg_factory.py
@@ -26,14 +26,13 @@ not_content_related = (Ping, HttpWait, MsgsAck, MsgContainer)
 
 
 class MsgFactory:
-    def __init__(self, server_time: float = 0):
+    def __init__(self):
         self.seq_no = SeqNo()
-        self.server_time = server_time
 
     def __call__(self, body: TLObject) -> Message:
         return Message(
             body,
-            MsgId(self.server_time),
+            MsgId(),
             self.seq_no(not isinstance(body, not_content_related)),
             len(body)
         )
diff --git a/pyrogram/session/internals/msg_id.py b/pyrogram/session/internals/msg_id.py
index 58474222..72b8e81f 100644
--- a/pyrogram/session/internals/msg_id.py
+++ b/pyrogram/session/internals/msg_id.py
@@ -16,18 +16,29 @@
 #  You should have received a copy of the GNU Lesser General Public License
 #  along with Pyrogram.  If not, see <http://www.gnu.org/licenses/>.
 
+import logging
+from datetime import datetime
 from time import monotonic
 
+log = logging.getLogger(__name__)
+
 
 class MsgId:
     reference_clock = monotonic()
     last_time = 0
     msg_id_offset = 0
+    server_time = 0
 
-    def __new__(cls, server_time: float = 0) -> int:
-        now = monotonic() - cls.reference_clock + server_time
+    def __new__(cls) -> int:
+        now = monotonic() - cls.reference_clock + cls.server_time
         cls.msg_id_offset = cls.msg_id_offset + 4 if now == cls.last_time else 0
         msg_id = int(now * 2 ** 32) + cls.msg_id_offset
         cls.last_time = now
 
         return msg_id
+
+    @classmethod
+    def set_server_time(cls, server_time: int):
+        if not cls.server_time:
+            cls.server_time = server_time
+            log.info(f"Time synced: {datetime.utcfromtimestamp(server_time)} UTC")
diff --git a/pyrogram/session/session.py b/pyrogram/session/session.py
index 6c385199..b25b2166 100644
--- a/pyrogram/session/session.py
+++ b/pyrogram/session/session.py
@@ -23,6 +23,7 @@ from concurrent.futures.thread import ThreadPoolExecutor
 from datetime import datetime, timedelta
 from hashlib import sha1
 from io import BytesIO
+import os
 
 import pyrogram
 from pyrogram import __copyright__, __license__, __version__
@@ -96,7 +97,7 @@ class Session:
 
         self.auth_key_id = sha1(auth_key).digest()[-8:]
 
-        self.session_id = Long(MsgId(time.time()))
+        self.session_id = os.urandom(8)
         self.msg_factory = MsgFactory()
 
         self.current_salt = None
@@ -247,9 +248,7 @@ class Session:
 
         for msg in messages:
             if msg.seq_no == 0:
-                server_time = msg.msg_id / (2 ** 32)
-                self.msg_factory.server_time = server_time
-                log.info(f"Time synced: {datetime.utcfromtimestamp(server_time)} UTC")
+                MsgId.set_server_time(msg.msg_id / (2 ** 32))
 
             if msg.seq_no % 2 != 0:
                 if msg.msg_id in self.pending_acks: