pyrogram/docs/source/faq/socket-send-raised-exception-oserror-timeouterror.rst

socket.send() raised exception, OSError(), TimeoutError()
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If you get this error chances are you are blocking the event loop for too long, most likely due to an improper use of
non-asynchronous or threaded operations which may lead to blocking code that prevents the event loop from running
properly.

You can consider the following:

- Use Pyrogram asynchronously in its intended way.
- Use shorter non-asynchronous processing loops.
- Use ``asyncio.sleep()`` instead of ``time.sleep()``.