diff --git a/frontools/sources.py b/frontools/sources.py
index eee4db0..5d2df72 100644
--- a/frontools/sources.py
+++ b/frontools/sources.py
@@ -5,12 +5,13 @@ from re import Pattern
 from re import compile as re_compile
 from typing import AsyncGenerator, AsyncIterable, Optional, cast
 
-from aiohttp import ClientSession, ClientConnectionError
+from aiohttp import ClientConnectionError, ClientSession
 from bs4 import BeautifulSoup
 from playwright.async_api import (
     BrowserContext,
     Page,
     Route,
+    TimeoutError,
     ViewportSize,
     async_playwright,
 )
@@ -30,7 +31,15 @@ class Browser:
         page = await self._browser_context.new_page()
         await page.route("*", self._source.route)
         await page.goto(url)
-        await page.wait_for_load_state("networkidle", timeout=1000 * 60 * 2)
+        for retry in range(0, 3):
+            try:
+                await page.wait_for_load_state("networkidle")
+                break
+            except TimeoutError:
+                if retry == 3:
+                    self._source._error_summary.add_error(
+                        f"Error while loading {url} : timeout, retried 3 times"
+                    )
         yield page
         await page.close()
 
@@ -51,13 +60,16 @@ class Source(ABC):
     ) -> AsyncGenerator[Browser, None]:
         """Return a Playwright browser that will eventually get files from local cache"""
 
-        viewport: ViewportSize = cast(
+        viewport: Optional[ViewportSize] = cast(
             ViewportSize, None
-        )  # playwright typings are broken
+        )  # Playwright typings are broken
 
         if width is not None:
-            assert height is not None
-            viewport = dict(width=width, height=height)
+            viewport = dict(
+                # height is not used, as screenshot are taken full page
+                width=width,
+                height=600,
+            )
 
         async with async_playwright() as pwright:
             browser = await pwright.firefox.launch(headless=True)
@@ -89,9 +101,9 @@ class CachedSource(Source):
                 async with session.get(url) as response:
                     return await response.content.read()
         except ClientConnectionError as ex:
-            self._error_summary.add_error(f'error while loading {url} : {ex}')
+            self._error_summary.add_error(f"error while loading {url} : {ex}")
 
-        return b''
+        return b""
 
 
 class OverrideSource(Source):