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Failures during high load

I currently face an issue in our test environment that under increased load we are seeing errors in the source system stating "Connection was closed during read"

The target system does not see this error, and we see successful transactions at the same time as the errors occur there are also successful transactions between the failures. We see several thousand of these errors

These requests are made over HTTPS to the target.

Successful transactions

No    Time     Source        Destination   Protocol  Length  TTL    Info                           1      0  TLSv1.2  951    64      Application Data                          2 0.047033  TCP      66    64      44278 → 443 [ACK] Seq=886 Ack=1179 Win=52128 Len=0 TSval=228434071 TSecr=3140704862


No      Time       Source          Destination   Protocol   Length  TTL     Info                           2598  32.90786    TCP        66     64      44626 → 443 [RST, ACK] Seq=28255 Ack=51505 Win=8340480 Len=0 TSval=0 TSecr=3141052135

I can provide more logs if required - But we need to understand where the reset is coming from, which I cannot understand at the minute.

Let me know further details required