The second reason is that you may be banned for a short time by the server.
When the server rules are violated (frequent reconnections, for example), the server gives a short ban. If you are unblocked this time and can watch the package without problem, it can last till the next time when you are banned again, and so on and so on.
This is a warning from the server to you, that some settings may be incorrect.
OK, let's see what happens after some time.