diff --git a/sagemcom_api/client.py b/sagemcom_api/client.py
index 920d5da..e2c6081 100644
--- a/sagemcom_api/client.py
+++ b/sagemcom_api/client.py
@@ -403,7 +403,7 @@ async def get_value_by_xpath(self, xpath: str, options: dict | None = None) -> d
             LoginTimeoutException,
             InvalidSessionException,
         ),
-        max_tries=1,
+        max_tries=2,
         on_backoff=retry_login,
     )
     async def get_values_by_xpaths(self, xpaths: dict[str, str], options: dict | None = None) -> dict:
@@ -445,7 +445,7 @@ async def set_value_by_xpath(self, xpath: str, value: str, options: dict | None
             LoginTimeoutException,
             InvalidSessionException,
         ),
-        max_tries=1,
+        max_tries=2,
         on_backoff=retry_login,
     )
     async def set_values_by_xpaths(self, xpaths: dict[str, str], options: dict | None = None) -> dict:
@@ -476,7 +476,7 @@ async def set_values_by_xpaths(self, xpaths: dict[str, str], options: dict | Non
             LoginTimeoutException,
             InvalidSessionException,
         ),
-        max_tries=1,
+        max_tries=2,
         on_backoff=retry_login,
     )
     async def get_device_info(self) -> DeviceInfo:
@@ -507,7 +507,7 @@ async def get_device_info(self) -> DeviceInfo:
             LoginTimeoutException,
             InvalidSessionException,
         ),
-        max_tries=1,
+        max_tries=2,
         on_backoff=retry_login,
     )
     async def get_hosts(self, only_active: bool | None = False) -> list[Device]:
@@ -529,7 +529,7 @@ async def get_hosts(self, only_active: bool | None = False) -> list[Device]:
             LoginTimeoutException,
             InvalidSessionException,
         ),
-        max_tries=1,
+        max_tries=2,
         on_backoff=retry_login,
     )
     async def get_port_mappings(self) -> list[PortMapping]:
@@ -547,7 +547,7 @@ async def get_port_mappings(self) -> list[PortMapping]:
             LoginTimeoutException,
             InvalidSessionException,
         ),
-        max_tries=1,
+        max_tries=2,
         on_backoff=retry_login,
     )
     async def get_logs(self) -> str:
diff --git a/sagemcom_api/exceptions.py b/sagemcom_api/exceptions.py
index 748d1ae..0617391 100644
--- a/sagemcom_api/exceptions.py
+++ b/sagemcom_api/exceptions.py
@@ -31,8 +31,13 @@ class AuthenticationException(UnauthorizedException):
     """Raised when authentication is not correct."""
 
 
-class InvalidSessionException(UnauthorizedException):
-    """Raised when session is invalid."""
+class InvalidSessionException(BaseSagemcomException):
+    """Raised when session is invalid.
+
+    This is a transient error that occurs when the router invalidates the
+    session (e.g., due to a concurrent login). It should not be treated as
+    a permanent authorization failure.
+    """
 
 
 class LoginRetryErrorException(BaseSagemcomException):