X8000 and Cisco AnyConnect VPN - can't detect policy serverm VPN fails

I've had a NightHawk X8000 for a year or so. My current employers use Cisco AnyConnect VPN client on their laptops and this fails to work when using my wireless connection via this router. If I use a wired ethernet cable, it's fine. There was a period of time when it works over wireless, for a week or so, then it just stopped and now I can't restore the service.

I've got a barebones configuration. I've been through suggestions on this forum to backup settings, reset the router and restore - this has had no effect.

-I do not have Dynamic QoS enabled

-No device access lists or IPv6 or anything.

-I only have 1 wireless network configured.

The VPN client can resolve the DNS name , and connect to it, but it then searches for a policy server (to check compliance) and it can't detect a policy server. I'll state that when I use a wired connection OR my stock SSE router this works without issue. Ridiculous considering this professional level kit.

I'm running the latest firmware V1.0.4.46_10.1.63

Any ideas?