M4300 +QNAP +Port Trunking

I'm trying to do Port trunking between a QNAP Server and a 4300 switch. It seems straightforward but I can't get it to work. The QNAP sees it's connected 20G

• 2 identical ports on QNAP set to Managed switch and 802.3ad and any version/ Balanced RR balances XOR /802.3ad
• On the QNAP static IP address, firewall off to test
• Connectivity all works if both ports have separate IP's so not cables etc
• 2 identical ports on Netgear Same SFP same speed same everything I think
• Netgear very simple setup all ports on 1 VLAN 1 - pretty much all default settings. 
• LAG config, select ports 19/20 on LAG 1 all the others have no ports enabled 
• LAg Config Admin Enabled, Link trap Disable, STP enable, if we enable static then the lag is up and we can't connect, if we disable static then LAG is down and we can connect
• Tried the various HASH modes and no joy 
• VLAN membership - all ports untagged, LAG ports all no tagging except 19/20 which are untagged

There is no connectvity until the LAG is down.

Not sure what else to try ... Any thoughts?