diff --git a/docs b/docs
index 326dc6dee..821000468 160000
--- a/docs
+++ b/docs
@@ -1 +1 @@
-Subproject commit 326dc6dee0cc0303db36c4bd5e74a241f8f9ad57
+Subproject commit 821000468d14f943496b8bbc7183360c83630d6b
diff --git a/schemas b/schemas
index 8662116b0..86b054b6f 160000
--- a/schemas
+++ b/schemas
@@ -1 +1 @@
-Subproject commit 8662116b0ada741008f19cb073ea4a4a6c29f807
+Subproject commit 86b054b6f2790f42dfeeb033fa8f2288657ab3d9
diff --git a/src/DataCenterConnection.php b/src/DataCenterConnection.php
index 97a431d86..564f2eb4c 100644
--- a/src/DataCenterConnection.php
+++ b/src/DataCenterConnection.php
@@ -394,10 +394,10 @@ final class DataCenterConnection implements JsonSerializable
     /**
      * Reset MTProto sessions.
      */
-    public function resetSession(): void
+    public function resetSession(string $why): void
     {
         foreach ($this->connections as $socket) {
-            $socket->resetSession();
+            $socket->resetSession($why);
         }
     }
     /**
diff --git a/src/Loop/Connection/ReadLoop.php b/src/Loop/Connection/ReadLoop.php
index c7d580aca..ad715d702 100644
--- a/src/Loop/Connection/ReadLoop.php
+++ b/src/Loop/Connection/ReadLoop.php
@@ -78,7 +78,7 @@ final class ReadLoop extends Loop
             });
             return self::STOP;
         } catch (SecurityException $e) {
-            $this->connection->resetSession();
+            $this->connection->resetSession("security exception {$e->getMessage()}");
             $this->API->logger("Got security exception in DC {$this->datacenter}, reconnecting...", Logger::ERROR);
             $this->connection->reconnect();
             throw $e;
@@ -89,7 +89,7 @@ final class ReadLoop extends Loop
                     if ($this->shared->hasTempAuthKey()) {
                         $this->API->logger("WARNING: Resetting auth key in DC {$this->datacenter}...", Logger::WARNING);
                         $this->shared->setTempAuthKey(null);
-                        $this->shared->resetSession();
+                        $this->shared->resetSession("-404");
                         foreach ($this->connection->new_outgoing as $message) {
                             $message->resetSent();
                         }
@@ -201,7 +201,7 @@ final class ReadLoop extends Loop
                 $session_id = substr($decrypted_data, 8, 8);
                 if ($session_id !== $this->connection->session_id) {
                     $this->API->logger('Session ID mismatch', Logger::FATAL_ERROR);
-                    $this->connection->resetSession();
+                    $this->connection->resetSession("session ID mismatch");
                     throw new NothingInTheSocketException();
                 }
                 $message_id = Tools::unpackSignedLong(substr($decrypted_data, 16, 8));
diff --git a/src/MTProto.php b/src/MTProto.php
index 7d8ad2328..89dd7d27c 100644
--- a/src/MTProto.php
+++ b/src/MTProto.php
@@ -936,7 +936,7 @@ final class MTProto implements TLCallback, LoggerGetter, SettingsGetter
         }
         $this->settings->setSchema(new TLSchema);
 
-        $this->resetMTProtoSession(true, true);
+        $this->resetMTProtoSession("upgrading madelineproto", true, true);
         $this->config = ['expires' => -1];
         $this->dh_config = ['version' => 0];
         $this->initialize($this->settings);
@@ -1013,7 +1013,7 @@ final class MTProto implements TLCallback, LoggerGetter, SettingsGetter
                 Lang::$currentPercentage = 0;
             }
             // Reset MTProto session (not related to user session)
-            $this->resetMTProtoSession();
+            $this->resetMTProtoSession("wakeup");
             // Update settings from constructor
             $this->updateSettings($settings);
             // Update TL callbacks
@@ -1250,14 +1250,14 @@ final class MTProto implements TLCallback, LoggerGetter, SettingsGetter
      * @param boolean $auth_key Whether to reset the auth key
      * @internal
      */
-    public function resetMTProtoSession(bool $de = true, bool $auth_key = false): void
+    public function resetMTProtoSession(string $why, bool $de = true, bool $auth_key = false): void
     {
         if (!\is_object($this->datacenter)) {
             throw new Exception(Lang::$current_lang['session_corrupted']);
         }
         foreach ($this->datacenter->getDataCenterConnections() as $id => $socket) {
             if ($de) {
-                $socket->resetSession();
+                $socket->resetSession("resetMTProtoSession: $why");
             }
             if ($auth_key) {
                 $socket->setTempAuthKey(null);
diff --git a/src/MTProtoSession/ResponseHandler.php b/src/MTProtoSession/ResponseHandler.php
index e60a8d89f..c94341efc 100644
--- a/src/MTProtoSession/ResponseHandler.php
+++ b/src/MTProtoSession/ResponseHandler.php
@@ -225,7 +225,7 @@ trait ResponseHandler
                 case 17:
                     $this->time_delta = ($message->getMsgId() >> 32) - time();
                     $this->API->logger('Set time delta to ' . $this->time_delta, Logger::WARNING);
-                    $this->API->resetMTProtoSession();
+                    $this->API->resetMTProtoSession("time delta update");
                     $this->shared->setTempAuthKey(null);
                     EventLoop::queue($this->shared->initAuthorization(...));
                     EventLoop::queue($this->methodRecall(...), $requestId);
diff --git a/src/MTProtoSession/Session.php b/src/MTProtoSession/Session.php
index a54f5481c..b07527656 100644
--- a/src/MTProtoSession/Session.php
+++ b/src/MTProtoSession/Session.php
@@ -99,9 +99,9 @@ trait Session
     /**
      * Reset MTProto session.
      */
-    public function resetSession(): void
+    public function resetSession(string $why): void
     {
-        $this->API->logger("Resetting session in DC {$this->datacenterId}...", Logger::WARNING);
+        $this->API->logger("Resetting session in DC {$this->datacenterId} due to $why...", Logger::WARNING);
         $this->session_id = Tools::random(8);
         $this->session_in_seq_no = 0;
         $this->session_out_seq_no = 0;
@@ -172,7 +172,7 @@ trait Session
     public function createSession(): void
     {
         if ($this->session_id === null) {
-            $this->resetSession();
+            $this->resetSession("creating initial session");
         }
         $this->abstractionQueueMutex ??= new LocalKeyedMutex;
     }