Windows 7 Laptops not reconnecting when roaming

Question

I have an issue that Laptops when students put them in standby and they move around campus they find that they can't re-connect to the wi-fi unless they reboot? What could be causing this? 
I'm using NPS and WPA2 and 8021x connected to a ZD3000.  ver 9.8.369

I can't upgrade as I have some End of life AP's

I've had a certificate expiring issue recently but that should be resolved.

unknown · Answer

Hi Neil,

To start with you can take a look at the below URL. From my experience these are WNIC driver issues

http://superuser.com/questions/652276/how-not-to-lose-wifi-after-going-to-standby-mode

i am hopeful that this should do the trick..