Ok, so after finally getting the time to upgrade the firewall (PA-220) the problem is resolved, it seems to be fixed in version 10.1.5-h2 at least for me, TAC recommended disabling IPv6 Firewalling but this did not solve the problem, there were no other suggestions as to how to workaround it, looking back over this thread it appears that for some it worked when certain time frames were used and others when they upgraded to 10.1.5, so give 10.1.5-h2 a try and hopefully it will resolve the issue.
I am still on 10.1.5-h2 and the issue has disappeared, I spoke to TAC and they suggested disabling IPv6 which I did and then an upgrade, only the upgrade worked, I wonder if there is anybody who could help raise this as major issue, it has been affecting all versions from 10.1 to my knowledge.
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