Using Bluecoat with ICAP to OPSWAT and Download Speed Drop to ZERO

OKAY..So I am not getting anywhere with this, might as well add it here.

We use bluecoat proxies with ICAP to OPSWAT AV scanning, adding to it, we have packet brokers inline which transfer everything to the Cisco IPS.

Recently we upgraded to OPSWAT v4 from v3, and now out of nowhere when downloading files in the +1GB range we notice the speed starts fluctuating, reaching 0 and then coming backup.

This happens multiple times, and eventually if it doesn't come up, the download simply dies with a "Network error" in the browser.

At times though even with fluctuation it makes it and the download completes.

Thoughts please..