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Why am I getting TCP Previous Segment not captured?

I'm working with a new embedded device and having performance issues.

I'm suspecting the devices tcp/ip stack, but need to understand the capture better.

I'm hoping someone here can give me some insight...

I see the "TCP Previous segment not captured" and after that, a retransmission occurs, causing a 1 to 2 second delay. The device needs to stream and I'm trying to understand what's going on.

Any help / insight would be greatly appreciated.