Why TCP socket send a RST packet instead of resending data when receives an incorrect ACK?

Note that there seems to be an additional packet missing from the dump, server bytes 2383-2385, though it seems the client did see them because it ACK'd them.

TCP is not "unstable" per se, it's a protocol. If anything is unstable it's your network connection. TCP has an algorithm for retrying on unstable networks.

It's also possible there's something wrong with your code, and it's possible there's an intermediary device timing out your connection.

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