Cisco Switches :: Sf-300 48port Failing 802.1x Re-authentication?

I have an issue with the sf-300 switch model, which i am depolying in lapsafe trolleys. The approach is to wake the laptops from the guest VLAN (20) with WOL have them authenticate with 802.1x and use DVA to put the ports in VLAN14 so updates can be pushed to them over night.
 
I have configured 802.1x, guest vlan and DVA which works initially, all host wake from WOL, the laptops successfully authenticate and are assigned to the VLAN (14). This remains stable for a time then the hosts fail reauthentication. I have also noticed that when a host is disconnected from a port and patched into another port the initial port remains in the authenticated state and the new port authenticates the client but the hostnames are missing on the 'authenticated hosts' page of the GUI, DVA fails. The ports display a port-failure message for a time then moves to failed reauthentication.
 
The only way I can get it to work again is to reboot the box. From the logs I can see the macs of laptops being rejected and I can also see attribute 26 being ignored. See log below. I am unsure as to why host are initially authenticated but reauthentication fails, is it not the same process?.
 
I have 11 of these switches and have configured 6 which all display the same behaviour. These switches are not CISCO I do not understand why they have badged them. The protocols/standards are implemented differently. If you incuded 'general ports' as an answer in a CISCO exam you would fail. There are also other issues I have noticed with these boxes, I am not impressed!.