When I use ASSISTANT and send 2 identical messages. Second message always is failed

For example
I send message 1: Hi, what is eth ?.
When I received response I send message 2: Hi, what is eth ?
And second message (if it is identical) is always returns failed response

Hi Vaym - welcome to the forum.

Can you share a little bit more detail? Like what is the error you get?
Do you create a new run?