MQTT stop working after receiving large bytes of data in FreeRTOS

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Isn’t this related to the question you asked here before?

LwIP mqtt fail in freeRTOS after a while & large payloads cant be stored after a subscribe - Kernel - FreeRTOS Community Forums

There is still the open question about the size of your Rx descriptor memory section. May be the root cause for both issues (in case they are different in the first place).