TCP previous segment not captured, why?

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Hi, I have a software who dumps data from a remote controller. The dump is made though a tcp connection that is not stable; my software is telling me "communication stopped" after 5-6 seconds

I run Wireshark to understand what was going on, but I'm not able to spot the reason behind this. All I see in the pcap trace is that when the connection ends, I have a general error "tcp previous segment not captured".

I uploaded the trace here https://www.cloudshark.org/captures/e...

Can anyone help?