This sounds like a common problem that certain data center environments
run into with 10 Gb/s and higher loads. In a nutshell, a simple
throw money at it solution to the problem is to use a switch with larger
buffers.
Nonetheless, there are plenty of good sources of material about the
phenomenon, such as:
<http://fasterdata.es.net/network-tuning/router-switch-buffer-size-issues/>
<https://people.ucsc.edu/~warner/buffer.html>
John